The openstack.org pages now support https and our references to
the site should by default be one signed by the organization.
Change-Id: I8a0588259d7b3fc8bd10504ffba7129b840e2a0d
Rename HACKING to HACKING.rst since it is a rst file and
reference the OpenStack hacking guide and remove
duplicated entries.
Change-Id: I9994594c7f8cb0f011d949b273bea08c68985e16