openstack/swift - swift - OpenDev: Free Software Needs Free Tools

The repo is Python using both Python 2 and 3 now, so update hacking to
version 2.0 which supports Python 2 and 3. Note that latest hacking
release 3.0 only supports version 3.
Fix problems found.
Remove hacking and friends from lower-constraints, they are not needed
for installation.
Change-Id: I9bd913ee1b32ba1566c420973723296766d1812f

Release notes are version independent, so remove version/release
values. We've found that projects now require the service package
to be installed in order to build release notes, and this is entirely
due to the current convention of pulling in the version information.
Release notes should not need installation in order to build, so this
unnecessary version setting needs to be removed.
This is needed for new release notes publishing, see
I56909152975f731a9d2c21b2825b972195e48ee8 and the discussion starting
at
http://lists.openstack.org/pipermail/openstack-dev/2017-November/124480.html
.
Change-Id: I1442656b3e4ab84ee5c219f5f4959bd7f41f01fe

As part of the docs migration work[0] for Pike we need to switch to use
the openstackdocstheme.
Fix one display problem with wrong section markup in the index file.
[0]https://review.openstack.org/#/c/472275/
Change-Id: Ide31218a7f37ba5d959de99cab48fc6513bf426f

Add the Apache License 2.0 description in ../conf.py which
is necessary.
Change-Id: Ief3767fdc22f582beb8683a9075dc25dbcb541cd

This should give the necessary tooling to set up the right
links in the right places so Swift has release notes listed
alongside other projects.
Change-Id: I4e5f1ce1fcfbb2943036c821a24a0b4a3a2d9fc8