Updated openstack/openstack
Project: openstack/python-neutronclient  5b5aa1a7a7573f32afb4e992bcb732a6e39f4500
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Make HACKING.rst DRYer

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

Change-Id: I921d273680be9a88e633291bc23995c8b19abc30