update cns.yaml to version 1.4.7 (#943)

Author: ashvindeodhar

cns/azure-cns.yaml

@@ -93,7 +93,7 @@ spec:
           effect: NoSchedule
       containers:
         - name: cns-container
-          image: mcr.microsoft.com/containernetworking/azure-cns:v1.4.6
+          image: mcr.microsoft.com/containernetworking/azure-cns:v1.4.7
           imagePullPolicy: IfNotPresent
           args: [ "-c", "tcp://$(CNSIpAddress):$(CNSPort)", "-t", "$(CNSLogTarget)"]
           volumeMounts: