The first attempt at getting all the tests to work missed out the
config_overrides in the base test class and the 'role' and
'assignment' groups.
Also, sha1_mangle_key was added to encode the key before calling
dogpile's sha1_mangle_key to support all the python34 tests.
Removed the skipIf's added for py34 as the tests are now working.
Also removed the testtools from requirements as we don't need it
anymore.
Change-Id: I0e09429e6739dc946f6e15398ccb264b4d62bb42
3411d7200f