Speeding up stuff.
HostDescription now passes up just a single IpAddress.
diff --git a/core/api/src/main/java/org/onlab/onos/net/NetworkResource.java b/core/api/src/main/java/org/onlab/onos/net/NetworkResource.java
new file mode 100644
index 0000000..55e35ba
--- /dev/null
+++ b/core/api/src/main/java/org/onlab/onos/net/NetworkResource.java
@@ -0,0 +1,7 @@
+package org.onlab.onos.net;
+
+/**
+ * Representation of a network resource.
+ */
+public interface NetworkResource {
+}