Adding app.xml for the mobility app.

Change-Id: Id8bf52b4e310bc0e7a215c2839227add5cd44e7a

+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Copyright 2015 Open Networking Laboratory
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<app name="org.onosproject.app.mobility" origin="ON.Lab" version="1.1.0"
+        features="onos-app-mobility">
+    <description>ONOS host mobility application</description>
+</app>