let hacking install its dependencies
let hacking install its dependencies

hacking pulls in the right versions of flake8, mccabe, pep8 and
pyflakes already, listing them explicitely is unnecessary and
can cause mismatches.

Change-Id: Id44c90ddd4a8a2204fd7ce600097bafbc9469993

stackforge/python-tackerclient,stackforge/python-tackerclient,openstack/python-tackerclient,openstack/python-tackerclient