Dropping explicit unicode literal

In python 3, all strings are considered as unicode string.

This patch drops the explicit unicode literal (u'...')
or (u"..") appearances from the unicode strings.

Change-Id: Ied40f6e4fefc66f847fed7e934d53ccb64be8dd4
diff --git a/cinder_tempest_plugin/api/volume/test_volume_unicode.py b/cinder_tempest_plugin/api/volume/test_volume_unicode.py
index ff6473a..026271b 100644
--- a/cinder_tempest_plugin/api/volume/test_volume_unicode.py
+++ b/cinder_tempest_plugin/api/volume/test_volume_unicode.py
@@ -72,13 +72,13 @@
     @decorators.idempotent_id('332be44d-5418-4fb3-a8f0-a3587de6929f')
     def test_snapshot_create_volume_description_non_ascii_code(self):
         # Create a volume with non-ascii description
-        description = u'\u05e7\u05d9\u05d9\u05e4\u05e9'
+        description = '\u05e7\u05d9\u05d9\u05e4\u05e9'
         volume = self.create_volume(description=description)
         vol_info = self.volumes_client.show_volume(volume['id'])['volume']
         self.assertEqual(description, vol_info['description'])
 
         # Create a snapshot with different non-ascii description
-        description = u'\u4e2d\u56fd\u793e\u533a'
+        description = '\u4e2d\u56fd\u793e\u533a'
         snapshot = self.create_snapshot(volume['id'], description=description)
         snapshot_info = self.snapshots_client.show_snapshot(
             snapshot['id'])['snapshot']