Cleanup test-requirements
python-subunit is not used directly anywhere
and it is dependency of both testrepository
and os-testr
(probably was used by some tox wrapper script before)
hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
coverage!=4.4,>=4.0 # Apache-2.0
ddt>=1.0.1 # MIT
-python-subunit>=1.0.0 # Apache-2.0/BSD
reno>=2.5.0 # Apache-2.0
sphinx>=1.6.2 # BSD
openstackdocstheme>=1.17.0 # Apache-2.0
