Export tooltip, logo and icon in myapplications REST service (#2970)

Add AppTip, AppLogo and AppIcon in the JSON result of /myapplications

{
   "myapplications" : [
      {
         "Applications" : [
            {
               "Application Test 1" : {
                  "AppDesc" : "A simple application displaying authenticated user",
                  "AppIcon" : "heart",
                  "AppTip" : "test info bulle",
                  "AppUri" : "http://test1.example.com:19876/"
               }
            },
            {
               "Application Test 2" : {
                  "AppDesc" : "The same simple application displaying authenticated user",
                  "AppLogo" : "http://auth.example.com:19876/static/common/apps/thumbnail.png",
                  "AppTip" : "Application Test 2",
                  "AppUri" : "http://test2.example.com:19876/"
               }
            }
         ],
         "Category" : "Sample applications"
      }
   ],
   "result" : 1
}