Updated openstack/openstack
Project: openstack/tempest  9ff2a78d7aa2aeb0520e3f49d66ae57830421c42
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Add ignore files related to coverage to .gitignore

.coverage and cover are generated by tox's cover task. So we should
ignore them.

Change-Id: Ica14d566fcd7bd31fea87471178db882add7813a