Tagging 2.2.7

1. a09fe5b Updating Copyright line to Open Networking Foundation by Brian O'Connor · 7 years ago
2. f9a16ed Fixed to not to create gateway group if it is already exists by Hyunsun Moon · 8 years ago
3. d331afd Fix to update gateway group only if new gateway is added by Hyunsun Moon · 8 years ago
4. 176c83d [ONOS-4871] Fix gateway external port from list to single port by Kyuhwi Choi · 8 years ago
5. 92d9ea4 [ONOS-4481] Integrate scalable gateway to openstackRouting by Kyuhwi Choi · 8 years ago
6. 7170129 Fixed duplicate package issue and javaDoc warnings by Hyunsun Moon · 8 years ago[Renamed (98%) from apps/scalablegateway/api/src/main/java/org/onosproject/scalablegateway/GatewayNode.java]
7. c5b33ea [ONOS-4291] Implement skeleton of gateway load balancer by Kyuhwi Choi · 8 years ago