Remove version from setup.cfg
Remove version from setup.cfg

This will be generated dynamically from git tags instead of being
hardwritten into the setup.cfg.

Change-Id: Ia81aabd11e8202dfb88f11348d453193a0819525

akash1808/python-barbicanclient,akash1808/python-barbicanclient,cloudkeep/python-barbicanclient,cloudkeep/python-barbicanclient,openstack/python-barbicanclient