Install hacking first and let it pull in right linter versions
Install hacking first and let it pull in right linter versions

hacking pulls in the right versions of flake8 and flake8 does
depend on the right versions of mccabe, flake8, pycodestyle by itself,
so install that one first and remove the explicit listing of those
dependencies.

Change-Id: I99ad1c1c31c4ba9e0c7e3ed692e650a9b4aba13b

openstack/openstack-ansible,bunchc/openstack-ansible,cfarquhar/openstack-ansible,cfarquhar/openstack-ansible,bunchc/openstack-ansible,stackforge/os-ansible-deployment,openstack/openstack-ansible,stackforge/os-ansible-deployment