This commit adds omit files for coverage. In tempest, we can get
coverage of its unit tests. But we don't need the coverage of api tests,
scenario tests and api_schema. Because we don't need to have their unit
tests.
Depends-on: I6a1e7a411a4b27fa0f9bd533276d5cb4d4759976
Change-Id: I91931a68485f03b88872a2f1f860cf8da2f28eb5
We don't need the result of tempest/tests/* and tempest/openstack/*
coverage. This commit omits it with introducing .coveragerc.
Partially implements bp unit-tests
Change-Id: I0465d916e195e3d340dece24ac7b01a0fc13e5c1