Remove dependencies from EVPN route system on unicast route system.

The route system is moving to an app, so EVPN code in the incubator
can't depend on it. I implemented an EvpnRouteTableId to remove this
dependency.

Change-Id: Id9af9fc0e0c680add1e061d0628ffdbd2a23dbde
diff --git a/incubator/api/src/main/java/org/onosproject/incubator/net/routing/EvpnTable.java b/incubator/api/src/main/java/org/onosproject/incubator/net/routing/EvpnTable.java
index eaa07af..1b8fe78 100755
--- a/incubator/api/src/main/java/org/onosproject/incubator/net/routing/EvpnTable.java
+++ b/incubator/api/src/main/java/org/onosproject/incubator/net/routing/EvpnTable.java
@@ -44,7 +44,7 @@
      *
      * @return route table ID
      */
-    RouteTableId id();
+    EvpnRouteTableId id();
 
     /**
      * Returns all routes in the route table.