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/net/src/main/java/org/onosproject/incubator/net/routing/impl/EvpnRouteManager.java b/incubator/net/src/main/java/org/onosproject/incubator/net/routing/impl/EvpnRouteManager.java
index 7ea4813..6757353 100644
--- a/incubator/net/src/main/java/org/onosproject/incubator/net/routing/impl/EvpnRouteManager.java
+++ b/incubator/net/src/main/java/org/onosproject/incubator/net/routing/impl/EvpnRouteManager.java
@@ -31,7 +31,7 @@
 import org.onosproject.incubator.net.routing.EvpnRouteSet;
 import org.onosproject.incubator.net.routing.EvpnRouteStore;
 import org.onosproject.incubator.net.routing.EvpnRouteStoreDelegate;
-import org.onosproject.incubator.net.routing.RouteTableId;
+import org.onosproject.incubator.net.routing.EvpnRouteTableId;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -146,7 +146,7 @@
     }
 
 
-    public Collection<RouteTableId> getRouteTables() {
+    public Collection<EvpnRouteTableId> getRouteTables() {
         return evpnRouteStore.getRouteTables();
     }