Fix pep8 warning with missing of dependecy
Fix pep8 warning with missing of dependecy

Move bash whitelisting to pep8 testenv in tox.ini

Change-Id: I445f6b99c7257e2cee3e22c44659a28a49c70576

openstack/sahara-scenario,openstack/sahara-tests,openstack/sahara-tests,openstack/sahara-tests,openstack/sahara-scenario,openstack/sahara-tests,openstack/sahara-scenario