ONOS-2947 Improvements to HostService

- Added ability to replace IPs for existing hosts to HostProviderService
- Moved createOrUpdateHost to use compute() (rather than get/set) in HostStore

Change-Id: I8ac035d010ae65f23158d2237f9fc97c8f811dd4
diff --git a/core/api/src/main/java/org/onosproject/net/host/HostStore.java b/core/api/src/main/java/org/onosproject/net/host/HostStore.java
index 35a2a8b..5894fe9 100644
--- a/core/api/src/main/java/org/onosproject/net/host/HostStore.java
+++ b/core/api/src/main/java/org/onosproject/net/host/HostStore.java
@@ -39,12 +39,13 @@
      * @param providerId      provider identification
      * @param hostId          host identification
      * @param hostDescription host description data
+     * @param replaceIps      replace IP set if true, merge IP set otherwise
      * @return appropriate event or null if no change resulted
      */
     HostEvent createOrUpdateHost(ProviderId providerId, HostId hostId,
-                                 HostDescription hostDescription);
+                                 HostDescription hostDescription,
+                                 boolean replaceIps);
 
-    // FIXME: API to remove only IpAddress is missing
     /**
      * Removes the specified host from the inventory.
      *