[ONOS-7624] Implement egress pipeline programming

- Implemented logic to handle double-tagged host in segmentrouting application.
- Added 'DummyVlanId' to segmentrouting application to keep track of dummy vlan for L3L2Unfiltered group chain and egress tables.
- Implemented L2Unfiltered group and Egress pipeline programming support in OFDPA pipeline.
- Added EGRESS flag to the forwardingObjective to program Egress tables.
- Fixed bugs when handling double-tagged ARP request, to get correct vlan id and reply with double-tagged packet.
- Fixed bugs in BasicHostConfig, to set the value of 'outerTpid' to 0x8100 if it is not specified.
- Fixed build(ARP/ICMP/ICMP6)reply to build double-tagged reply if corresponding request is double-tagged.

Change-Id: I1fdc30b55827c3f73fad9e854bcaa5fb23f7bcd0
diff --git a/utils/misc/src/main/java/org/onlab/packet/ICMP6.java b/utils/misc/src/main/java/org/onlab/packet/ICMP6.java
index 0bcf129..31aabfc 100644
--- a/utils/misc/src/main/java/org/onlab/packet/ICMP6.java
+++ b/utils/misc/src/main/java/org/onlab/packet/ICMP6.java
@@ -385,6 +385,8 @@
         ipv6Reply.setPayload(icmpv6Reply);
 
         ethReply.setEtherType(Ethernet.TYPE_IPV6);
+        ethReply.setQinQVID(ethRequest.getQinQVID());
+        ethReply.setQinQTPID(ethRequest.getQinQTPID());
         ethReply.setVlanID(ethRequest.getVlanID());
         ethReply.setDestinationMACAddress(ethRequest.getSourceMACAddress());
         ethReply.setSourceMACAddress(ethRequest.getDestinationMACAddress());