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/store/src/main/java/org/onosproject/incubator/store/routing/impl/EmptyEvpnRouteTable.java b/incubator/store/src/main/java/org/onosproject/incubator/store/routing/impl/EmptyEvpnRouteTable.java
index fc59649..aa56d71 100755
--- a/incubator/store/src/main/java/org/onosproject/incubator/store/routing/impl/EmptyEvpnRouteTable.java
+++ b/incubator/store/src/main/java/org/onosproject/incubator/store/routing/impl/EmptyEvpnRouteTable.java
@@ -20,8 +20,8 @@
 import org.onosproject.incubator.net.routing.EvpnPrefix;
 import org.onosproject.incubator.net.routing.EvpnRoute;
 import org.onosproject.incubator.net.routing.EvpnRouteSet;
+import org.onosproject.incubator.net.routing.EvpnRouteTableId;
 import org.onosproject.incubator.net.routing.EvpnTable;
-import org.onosproject.incubator.net.routing.RouteTableId;
 
 import java.util.Collection;
 import java.util.Collections;
@@ -31,7 +31,7 @@
  */
 public final class EmptyEvpnRouteTable implements EvpnTable {
 
-    private final RouteTableId id = new RouteTableId("empty");
+    private final EvpnRouteTableId id = new EvpnRouteTableId("empty");
 
     private static final EmptyEvpnRouteTable INSTANCE = new EmptyEvpnRouteTable();
 
@@ -58,7 +58,7 @@
     }
 
     @Override
-    public RouteTableId id() {
+    public EvpnRouteTableId id() {
         return id;
     }