Work toward common IP address classes.

 * Updated classes PortAddresses (in core/api) and Interface (in sdnip)
   to use class InterfaceIpAddress instead of IpPrefix
 * Updated corresponding unit tests and relevant code
 * Minor refactoring inside ProxyArpManager to simplify some of the
   logic and usage related to PortAddresses. Also, renamed
   method findOutsidePortInSubnet() to findPortInSubnet() and updated
   its implementation to reflect better its usage.
diff --git a/core/net/src/test/java/org/onlab/onos/net/host/impl/HostManagerTest.java b/core/net/src/test/java/org/onlab/onos/net/host/impl/HostManagerTest.java
index 6864fd7..c20da19 100644
--- a/core/net/src/test/java/org/onlab/onos/net/host/impl/HostManagerTest.java
+++ b/core/net/src/test/java/org/onlab/onos/net/host/impl/HostManagerTest.java
@@ -31,10 +31,12 @@
 import org.onlab.onos.net.host.HostProvider;
 import org.onlab.onos.net.host.HostProviderRegistry;
 import org.onlab.onos.net.host.HostProviderService;
+import org.onlab.onos.net.host.InterfaceIpAddress;
 import org.onlab.onos.net.host.PortAddresses;
 import org.onlab.onos.net.provider.AbstractProvider;
 import org.onlab.onos.net.provider.ProviderId;
 import org.onlab.onos.store.trivial.impl.SimpleHostStore;
+import org.onlab.packet.IpAddress;
 import org.onlab.packet.IpPrefix;
 import org.onlab.packet.MacAddress;
 import org.onlab.packet.VlanId;
@@ -68,9 +70,15 @@
     private static final ConnectPoint CP1 = new ConnectPoint(DID1, P1);
     private static final ConnectPoint CP2 = new ConnectPoint(DID2, P2);
 
-    private static final IpPrefix PREFIX1 = IpPrefix.valueOf("10.0.1.0/24");
-    private static final IpPrefix PREFIX2 = IpPrefix.valueOf("10.1.0.0/16");
-    private static final IpPrefix PREFIX3 = IpPrefix.valueOf("5.8.2.0/23");
+    private static final InterfaceIpAddress IA1 =
+        new InterfaceIpAddress(IpAddress.valueOf("10.1.1.1"),
+                               IpPrefix.valueOf("10.1.1.0/24"));
+    private static final InterfaceIpAddress IA2 =
+        new InterfaceIpAddress(IpAddress.valueOf("10.2.2.2"),
+                               IpPrefix.valueOf("10.2.0.0/16"));
+    private static final InterfaceIpAddress IA3 =
+        new InterfaceIpAddress(IpAddress.valueOf("10.3.3.3"),
+                               IpPrefix.valueOf("10.3.3.0/24"));
 
     private HostManager mgr;
 
@@ -207,23 +215,24 @@
 
     @Test
     public void bindAddressesToPort() {
-        PortAddresses add1 = new PortAddresses(CP1,
-                                               Sets.newHashSet(PREFIX1, PREFIX2), MAC1);
+        PortAddresses add1 =
+            new PortAddresses(CP1, Sets.newHashSet(IA1, IA2), MAC1);
 
         mgr.bindAddressesToPort(add1);
         PortAddresses storedAddresses = mgr.getAddressBindingsForPort(CP1);
 
-        assertTrue(add1.ips().equals(storedAddresses.ips()));
+        assertTrue(add1.ipAddresses().equals(storedAddresses.ipAddresses()));
         assertTrue(add1.mac().equals(storedAddresses.mac()));
 
         // Add some more addresses and check that they're added correctly
-        PortAddresses add2 = new PortAddresses(CP1, Sets.newHashSet(PREFIX3), null);
+        PortAddresses add2 =
+            new PortAddresses(CP1, Sets.newHashSet(IA3),  null);
 
         mgr.bindAddressesToPort(add2);
         storedAddresses = mgr.getAddressBindingsForPort(CP1);
 
-        assertTrue(storedAddresses.ips().equals(
-                Sets.newHashSet(PREFIX1, PREFIX2, PREFIX3)));
+        assertTrue(storedAddresses.ipAddresses().equals(
+                Sets.newHashSet(IA1, IA2, IA3)));
         assertTrue(storedAddresses.mac().equals(MAC1));
 
         PortAddresses add3 = new PortAddresses(CP1, null, MAC2);
@@ -231,29 +240,29 @@
         mgr.bindAddressesToPort(add3);
         storedAddresses = mgr.getAddressBindingsForPort(CP1);
 
-        assertTrue(storedAddresses.ips().equals(
-                Sets.newHashSet(PREFIX1, PREFIX2, PREFIX3)));
+        assertTrue(storedAddresses.ipAddresses().equals(
+                Sets.newHashSet(IA1, IA2, IA3)));
         assertTrue(storedAddresses.mac().equals(MAC2));
     }
 
     @Test
     public void unbindAddressesFromPort() {
-        PortAddresses add1 = new PortAddresses(CP1,
-                                               Sets.newHashSet(PREFIX1, PREFIX2), MAC1);
+        PortAddresses add1 =
+            new PortAddresses(CP1, Sets.newHashSet(IA1, IA2), MAC1);
 
         mgr.bindAddressesToPort(add1);
         PortAddresses storedAddresses = mgr.getAddressBindingsForPort(CP1);
 
-        assertTrue(storedAddresses.ips().size() == 2);
+        assertTrue(storedAddresses.ipAddresses().size() == 2);
         assertNotNull(storedAddresses.mac());
 
-        PortAddresses rem1 = new PortAddresses(CP1,
-                                               Sets.newHashSet(PREFIX1), null);
+        PortAddresses rem1 =
+            new PortAddresses(CP1, Sets.newHashSet(IA1), null);
 
         mgr.unbindAddressesFromPort(rem1);
         storedAddresses = mgr.getAddressBindingsForPort(CP1);
 
-        assertTrue(storedAddresses.ips().equals(Sets.newHashSet(PREFIX2)));
+        assertTrue(storedAddresses.ipAddresses().equals(Sets.newHashSet(IA2)));
         assertTrue(storedAddresses.mac().equals(MAC1));
 
         PortAddresses rem2 = new PortAddresses(CP1, null, MAC1);
@@ -261,47 +270,48 @@
         mgr.unbindAddressesFromPort(rem2);
         storedAddresses = mgr.getAddressBindingsForPort(CP1);
 
-        assertTrue(storedAddresses.ips().equals(Sets.newHashSet(PREFIX2)));
+        assertTrue(storedAddresses.ipAddresses().equals(Sets.newHashSet(IA2)));
         assertNull(storedAddresses.mac());
 
-        PortAddresses rem3 = new PortAddresses(CP1,
-                                               Sets.newHashSet(PREFIX2), MAC1);
+        PortAddresses rem3 =
+            new PortAddresses(CP1, Sets.newHashSet(IA2), MAC1);
 
         mgr.unbindAddressesFromPort(rem3);
         storedAddresses = mgr.getAddressBindingsForPort(CP1);
 
-        assertTrue(storedAddresses.ips().isEmpty());
+        assertTrue(storedAddresses.ipAddresses().isEmpty());
         assertNull(storedAddresses.mac());
     }
 
     @Test
     public void clearAddresses() {
-        PortAddresses add1 = new PortAddresses(CP1,
-                                               Sets.newHashSet(PREFIX1, PREFIX2), MAC1);
+        PortAddresses add1 =
+            new PortAddresses(CP1, Sets.newHashSet(IA1, IA2), MAC1);
 
         mgr.bindAddressesToPort(add1);
         PortAddresses storedAddresses = mgr.getAddressBindingsForPort(CP1);
 
-        assertTrue(storedAddresses.ips().size() == 2);
+        assertTrue(storedAddresses.ipAddresses().size() == 2);
         assertNotNull(storedAddresses.mac());
 
         mgr.clearAddresses(CP1);
         storedAddresses = mgr.getAddressBindingsForPort(CP1);
 
-        assertTrue(storedAddresses.ips().isEmpty());
+        assertTrue(storedAddresses.ipAddresses().isEmpty());
         assertNull(storedAddresses.mac());
     }
 
     @Test
     public void getAddressBindingsForPort() {
-        PortAddresses add1 = new PortAddresses(CP1,
-                                               Sets.newHashSet(PREFIX1, PREFIX2), MAC1);
+        PortAddresses add1 =
+            new PortAddresses(CP1, Sets.newHashSet(IA1, IA2), MAC1);
 
         mgr.bindAddressesToPort(add1);
         PortAddresses storedAddresses = mgr.getAddressBindingsForPort(CP1);
 
         assertTrue(storedAddresses.connectPoint().equals(CP1));
-        assertTrue(storedAddresses.ips().equals(Sets.newHashSet(PREFIX1, PREFIX2)));
+        assertTrue(storedAddresses.ipAddresses().equals(
+                        Sets.newHashSet(IA1, IA2)));
         assertTrue(storedAddresses.mac().equals(MAC1));
     }
 
@@ -311,8 +321,8 @@
 
         assertTrue(storedAddresses.isEmpty());
 
-        PortAddresses add1 = new PortAddresses(CP1,
-                                               Sets.newHashSet(PREFIX1, PREFIX2), MAC1);
+        PortAddresses add1 =
+            new PortAddresses(CP1, Sets.newHashSet(IA1, IA2), MAC1);
 
         mgr.bindAddressesToPort(add1);
 
@@ -320,8 +330,8 @@
 
         assertTrue(storedAddresses.size() == 1);
 
-        PortAddresses add2 = new PortAddresses(CP2,
-                                               Sets.newHashSet(PREFIX3), MAC2);
+        PortAddresses add2 =
+            new PortAddresses(CP2, Sets.newHashSet(IA3), MAC2);
 
         mgr.bindAddressesToPort(add2);