Moving VTN away from old XOS APIs onto GRPC APIs.

Instead of the VTN app pulling the ServiceNetwork and SerivcePort
info from XOS, the VTN simply sets a flag to indicate it wants a
full resync of the data. The VTN synchronizer then knows to send
all ServiceNetwork and ServicePort information on next sync.

Change-Id: I84bd1e6bb691dcbb9667c30c252921894b06bb2a
diff --git a/xos/vtn.xproto b/xos/vtn.xproto
index bd7ff54..ec98877 100644
--- a/xos/vtn.xproto
+++ b/xos/vtn.xproto
@@ -15,4 +15,5 @@
      required string xosPassword = 10 [default = "letmein", max_length = 255, content_type = "stripped", blank = False, null = False, db_index = False];
      required int32 vtnAPIVersion = 11 [default = 1, null = False, db_index = False, blank = False];
      required string controllerPort = 12 [default = "onos-cord:6653", max_length = 255, content_type = "stripped", blank = False, null = False, db_index = False];
+     required bool resync = 13 [default = False, null = False, db_index = False, blank = False];
 }