Add REST API to change administrative state of a port.

Change-Id: Ib0f2fc9e0a2d8126288784d5da78367037638625
diff --git a/web/api/src/main/resources/definitions/PortAdministrativeState.json b/web/api/src/main/resources/definitions/PortAdministrativeState.json
new file mode 100644
index 0000000..e6969a9
--- /dev/null
+++ b/web/api/src/main/resources/definitions/PortAdministrativeState.json
@@ -0,0 +1,12 @@
+{
+  "type": "object",
+  "required": [
+    "enabled"
+  ],
+  "properties": {
+    "enabled": {
+      "type": "boolean",
+      "example": true
+    }
+  }
+}