Fix: retrieve port bridge port MAC from deviceService rather via ovsdb

1. Derive gateway IP address from POD subnet CIDR.
2. Remove the logic of injecting gateway IP address.

Change-Id: Ice44c1c4b41bc1689954041aee6441a379e5bacd
diff --git a/apps/k8s-networking/app/src/test/resources/org/onosproject/k8snetworking/web/k8s-network.json b/apps/k8s-networking/app/src/test/resources/org/onosproject/k8snetworking/web/k8s-network.json
index 6efe965..136c9e3 100644
--- a/apps/k8s-networking/app/src/test/resources/org/onosproject/k8snetworking/web/k8s-network.json
+++ b/apps/k8s-networking/app/src/test/resources/org/onosproject/k8snetworking/web/k8s-network.json
@@ -4,6 +4,5 @@
   "type": "VXLAN",
   "mtu": 1500,
   "segmentId": "1",
-  "gatewayIp": "10.10.10.1",
-  "cidr": "32"
+  "cidr": "10.10.0.0/24"
 }
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