CORD-2273: Make vENB service use multistructlog

Change-Id: Ia7e4ab4a2bcf1ceeb6f466358cbd29e496feedc3
diff --git a/xos/synchronizer/steps/sync_venbserviceinstance.py b/xos/synchronizer/steps/sync_venbserviceinstance.py
index 19ff9d5..3f48e05 100644
--- a/xos/synchronizer/steps/sync_venbserviceinstance.py
+++ b/xos/synchronizer/steps/sync_venbserviceinstance.py
@@ -66,7 +66,7 @@
 
         except Exception:
             ip_address = "error"
-            print "get failed -- %s" % (parameter)
+            self.log.error("Could not fetch parameter", parameter = parameter, network_name = network_name)
 
         return ip_address