add synchronizer and tosca files for vPGWC

Change-Id: I3f02594390a50d01820bcddb76f2a0a17e768db1
diff --git a/xos/synchronizer/stop.sh b/xos/synchronizer/stop.sh
new file mode 100755
index 0000000..299641a
--- /dev/null
+++ b/xos/synchronizer/stop.sh
@@ -0,0 +1,2 @@
+# Kill the observer
+pkill -9 -f vpgwc-synchronizer.py