Changes command to create the directory

Reasons:
- os.makedirs since running under normal user access
  will not be able to create the directory at
  root locations like /var/lib.

Changes:
- Used utils.execute like used at other places
  for working under root access.
- Test changed to test utils.execute instead of os.makedirs

Change-Id: Ie2313ae4cc22ac4a9baa4d8e099080f227a980c4
Closes-Bug: #1261492

trove/guestagent/volume.py

@@ -132,7 +132,7 @@ class VolumeMountPoint(object):
 
     def mount(self):
         if not os.path.exists(self.mount_point):
-            os.makedirs(self.mount_point)
+            utils.execute("sudo", "mkdir", "-p", self.mount_point)
         LOG.debug("Adding volume. Device path:%s, mount_point:%s, "
                   "volume_type:%s, mount options:%s" %
                   (self.device_path, self.mount_point, self.volume_fstype,

trove/tests/unittests/guestagent/test_volume.py

@@ -161,12 +161,12 @@ class VolumeMountPointTest(testtools.TestCase):
         os.path.exists = MagicMock(return_value=False)
         fake_spawn = _setUp_fake_spawn()
 
-        os.makedirs = MagicMock()
+        utils.execute = Mock()
 
         self.volumeMountPoint.mount()
 
         self.assertEqual(1, os.path.exists.call_count)
-        self.assertEqual(1, os.makedirs.call_count)
+        self.assertEqual(1, utils.execute.call_count)
         self.assertEqual(1, fake_spawn.expect.call_count)
 
         os.path.exists = origin_