Remove ordereddict requirement
This was only needed for Python < 2.7, and it doesn't see
to be used by anything.
@@ -10,7 +10,6 @@ hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
mock>=2.0.0 # BSD
python-subunit>=1.0.0 # Apache-2.0/BSD
python-tackerclient>=0.8.0 # Apache-2.0
-ordereddict>=1.1 # MIT
oslotest>=3.2.0 # Apache-2.0
os-testr>=1.0.0 # Apache-2.0
tempest>=17.1.0 # Apache-2.0
