Don't git ignore .mailmap and .testr.conf
Don't git ignore .mailmap and .testr.conf

These should have been whitelisted in the prior
gitignore change.

Change-Id: I21dce6256991c773f7a167f8e15499763db5eb3c

scottdangelo/cinderclient-api-microversions,eayunstack/python-cinderclient,scottdangelo/cinderclient-api-microversions,eayunstack/python-cinderclient