CORD-349 Support VLAN cross-connect traffic

Change related to this topic:
- Support VLAN cross-connect traffic
    Utilize ports subjectClass to achieve. For non-xConnect port, set interface VLAN to -1
- Remove VLAN checking since we have multiple VLANs per port
- Hash the L2 interface group key generation to include VLAN as well
- Update the network-cfg.json sample

Other refactoring changes:
- Read next objective stores from srManager directly
- Use constant for flow priority
- CORD-267 Javadoc fix

Change-Id: I4ca8c2d9c8b3633a4a0101c5070d19343f7e5b90
diff --git a/src/main/java/org/onosproject/segmentrouting/DefaultTunnel.java b/src/main/java/org/onosproject/segmentrouting/DefaultTunnel.java
index 7016143..7d757c4 100644
--- a/src/main/java/org/onosproject/segmentrouting/DefaultTunnel.java
+++ b/src/main/java/org/onosproject/segmentrouting/DefaultTunnel.java
@@ -20,7 +20,7 @@
 import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
- * Tunnel class.
+ * Default Tunnel class.
  */
 public class DefaultTunnel implements Tunnel {