Support group mods and group stats requests.

Added support for match IPv4 destination address.

Change-Id: I8693299f29ba3c45f61b936877d443218e5410c4
diff --git a/internal/pkg/openflow/utils.go b/internal/pkg/openflow/utils.go
index 7a29e66..dac2f22 100644
--- a/internal/pkg/openflow/utils.go
+++ b/internal/pkg/openflow/utils.go
@@ -77,6 +77,13 @@
 	case ofp.OFPATPopMpls: //PopMpls
 	case ofp.OFPATSetQueue: //SetQueue
 	case ofp.OFPATGroup: //ActionGroup
+		ofpAction.Type = openflow_13.OfpActionType_OFPAT_GROUP
+		group := action.(*ofp.ActionGroup)
+		ofpAction.Action = &openflow_13.OfpAction_Group{
+			Group: &openflow_13.OfpActionGroup{
+				GroupId: group.GroupId,
+			},
+		}
 	case ofp.OFPATSetNwTtl: //SetNwTtl
 	case ofp.OFPATDecNwTtl: //DecNwTtl
 	case ofp.OFPATSetField: //SetField