Re-Sync oslo-incubator fixtures

Syncing to add fixture.logging
(I7a4ab4f181634ed5b92ce88e9ed1d976ecb633a7) which will be enabled for
unit tests in a subsequent patch.

Commits Include:
 782fc83 Fixture to reraise exceptions raised during logging
 c178e56 Add basic Python 3 tests
 f6a97ac Enhance config fixture to support registering options
 b9d2ee4 Cleanup config fixture docstrings
 b8a191b Add 'new' parameter to mock.Patch and mock.PatchObject classes
 45658e2 Fix violations of H302:import only modules
 6fa29ae Trivial: Make vertical white space after license header
 consistent
 12bcdb7 Remove vim header
 3970d46 Fix typos in oslo
 371fa42 Move LockFixture into a fixtures module

Change-Id: I87e9e51610f3d00e92755c4f40aa295e60e440fb
Merge "Re-Sync oslo-incubator fixtures"