Include tools folder in tox pep8 env
Include tools folder in tox pep8 env

Enable tox to run pep8 against tools directory.

Change-Id: I8ed1836bd969b18d8fe6c64b4c3c0e2d64204009

stackforge/refstack,openstack/refstack,stackforge/refstack,stackforge/refstack,openstack/refstack,openstack/refstack,stackforge/refstack,openstack/refstack