Fixed service port create failure

Also enhanced service network and port codec and added more unit tests

Change-Id: I523acc49dc1472520bd15a47f9a591cd95297ea0
diff --git a/src/test/resources/org/opencord/cordvtn/codec/service-network.json b/src/test/resources/org/opencord/cordvtn/codec/service-network.json
index 9235f99..d7bf5a7 100644
--- a/src/test/resources/org/opencord/cordvtn/codec/service-network.json
+++ b/src/test/resources/org/opencord/cordvtn/codec/service-network.json
@@ -1,8 +1,16 @@
 {
   "serviceNetwork": {
-    "id": "A",
-    "name": "A",
-    "type": "management_local",
-    "providerNetworks": []
+    "id": "network_1",
+    "name": "network_1",
+    "type": "private",
+    "segment_id": 1,
+    "subnet": "192.168.0.0/24",
+    "service_ip": "192.168.0.1",
+    "providers": [
+      {
+        "id": "provider_1",
+        "bidirectional": true
+      }
+    ]
   }
 }
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