Return http promise on testPassword

Instead of creating a new promise with q.defer(), just return the
http promise. This is much simpler and the recommended solution.

Tested: Changed the password and verified the wrong old password
returned an error on a Witherspoon.
Change-Id: I1b412426da58ec3185f6d83bd53fdc984c7785e8
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/app/common/services/api-utils.js b/app/common/services/api-utils.js
index bc89eb1..980f1a2 100644
--- a/app/common/services/api-utils.js
+++ b/app/common/services/api-utils.js
@@ -193,8 +193,7 @@
                 // Calls /login without the current session to verify the given password is correct
                 // ignore the interceptor logout on a bad password
                 DataService.ignoreHttpError = true;
-                var deferred = $q.defer();
-                $http({
+                return $http({
                   method: 'POST',
                   url: DataService.getHost() + "/login",
                   headers: {
@@ -204,15 +203,8 @@
                   withCredentials: false,
                   data: JSON.stringify({"data": [username, password]})
                 }).then(function(response){
-                  var json = JSON.stringify(response.data);
-                  var content = JSON.parse(json);
-                  DataService.ignoreHttpError = false;
-                  deferred.resolve(content.data);
-                }, function(error){
-                  DataService.ignoreHttpError = false;
-                  deferred.reject(error);
+                  return response.data;
                 });
-                return deferred.promise;
               },
               logout: function(callback){
                 $http({