Updated openstack/openstack
Project: openstack/glance  8d232f7860ec7027e27d5275234cb7a08a22c148
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Cleanup and make HACKING.rst DRYer

Reference the OpenStack hacking guide in HACKING.rst and remove
duplicate entries. Adds placeholder section for glance specific
rules.

Change-Id: I1bfff8c69c9370e2d648197b7e71e229695ef627