Add tox.ini file and fix pep8 errors.

Add tox.ini file and fix up several pep8 failures.

Change-Id: I3c64d2e790a8dfe37aa9091b001c3a5b85bc8586
Reviewed-on: https://review.openstack.org/20661
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Dan Prince <dprince@redhat.com>
Approved: Dan Prince <dprince@redhat.com>
Tested-by: Jenkins