Updated openstack/openstack
Project: openstack/python-glanceclient  ab6eb00e64f376fc26baa299a4f51673aa3a7cbd
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Make HACKING.rst DRYer

Reference the OpenStack hacking guide in HACKING.rst and remove
duplicated entries.

Change-Id: I80099c4da8928874f4647ab6f306876db126b0a3