Remove usage of ordereddict

This was only needed for Python < 2.7, but glanceclient's setup.cfg
already declares compatibility only with 2.7.

Change-Id: I80d42abf5dd5565da424a90a93545ba82ef7a58d

glanceclient/tests/unit/test_shell.py

@@ -15,10 +15,7 @@
 #    under the License.
 
 import argparse
-try:
+from collections import OrderedDict
-    from collections import OrderedDict
-except ImportError:
-    from ordereddict import OrderedDict
 import hashlib
 import logging
 import os

test-requirements.txt

@@ -5,7 +5,6 @@ hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 
 coverage!=4.4,>=4.0 # Apache-2.0
 mock>=2.0.0 # BSD
-ordereddict>=1.1 # MIT
 os-client-config>=1.28.0 # Apache-2.0
 openstackdocstheme>=1.18.1 # Apache-2.0
 reno>=2.5.0 # Apache-2.0