Rename #getNumber -> #getPortNumber

- Part of ONOS-1564

Change-Id: I3c082c384564920c7b5baa8ba74a1cb534f64f6d
diff --git a/src/main/java/net/onrc/onos/core/topology/LinkEvent.java b/src/main/java/net/onrc/onos/core/topology/LinkEvent.java
index f72a429..140e4c7 100644
--- a/src/main/java/net/onrc/onos/core/topology/LinkEvent.java
+++ b/src/main/java/net/onrc/onos/core/topology/LinkEvent.java
@@ -81,8 +81,8 @@
     }
 
     public ByteBuffer getIDasByteBuffer() {
-        return getLinkID(src.getDpid(), src.getNumber(),
-                dst.getDpid(), dst.getNumber());
+        return getLinkID(src.getDpid(), src.getPortNumber(),
+                dst.getDpid(), dst.getPortNumber());
     }
 
     @Override