Tests cleanup temporary files
Tests cleanup temporary files

Some tests in test_auth_token_middleware weren't cleaning up
temporary files because the original filename was lost when
set_middleware() was called twice or tearDown() didn't clean up
the files.

The fix strategy is to use cleanUp(), because it will delete all
files even if called multiple times, and it doesn't rely on
tearDown() being called in subclasses.

Change-Id: Ib78150378ba6b622c9bc451ef4b331a87c17c56a

klmitch/python-keystoneclient,sdpp/python-keystoneclient,alexpilotti/python-keystoneclient,jamielennox/python-keystoneclient,darren-wang/ksc,Mercador/python-keystoneclient,alexpilotti/python-keystoneclient,ging/python-keystoneclient,magic0704/python-keystoneclient,klmitch/python-keystoneclient,magic0704/python-keystoneclient,darren-wang/ksc,ging/python-keystoneclient,Mercador/python-keystoneclient,jamielennox/python-keystoneclient,metacloud/python-keystoneclient,metacloud/python-keystoneclient,sdpp/python-keystoneclient,jamielennox/python-keystoneclient