Added delete all flow rules during Corsa switch handshake

Change-Id: I885dad9453754bf86f12d4a86541fe7bfe7efd72

added delete all rules in corsa switch handshake

Change-Id: I7905a754653f6fc7eb8643023372e6dfa779cf26
diff --git a/apps/bgprouter/src/main/java/org/onosproject/bgprouter/BgpRouter.java b/apps/bgprouter/src/main/java/org/onosproject/bgprouter/BgpRouter.java
index 413401a..1035cd6 100644
--- a/apps/bgprouter/src/main/java/org/onosproject/bgprouter/BgpRouter.java
+++ b/apps/bgprouter/src/main/java/org/onosproject/bgprouter/BgpRouter.java
@@ -298,6 +298,7 @@
                     .setEthDst(nextHop.mac())
                     .pushVlan()
                     .setVlanId(egressIntf.vlan())
+                    .setVlanPcp((byte) 0)
                     .setOutput(egressIntf.connectPoint().port())
                     .build();