$namespace = openstack.image.v{1|2}

The subcommand documents for $namespace were hardcoded and thus prone to
drift over time. This commit removes the hardcoded content and uses the
autoprogram-cliff directive to generate them automatically from the
subcommand configuration classes.

Some reorganization happened here. The `image` subcommand name is shared
by image v1 and v2. Previously the hardcoded document had them combined
and interleaved. Attempting to preserve this with autoprogram-cliff
would have required significant additional infrastructure. However,
since most readers care completely about one and not at all about the
other, we instead split the v1 and v2 versions of these commands into
separate pages. In case links to the old pages exist in the wild, they
are preserved, but moved (with redirects) to a hidden directory, and
populated simply with links to the new version-specific generated
documents.

Change-Id: I24dc6dc10671c7f1267c27002542f61f8a3c18ae

$namespace = openstack.identity.v{2|3}

The subcommand documents for $namespace were hardcoded and thus prone to
drift over time. This commit removes the hardcoded content and uses the
autoprogram-cliff directive to generate them automatically from the
subcommand configuration classes.

Special things:

- Some reorganization happened here. Certain subcommand names, such as
  `endpoint` and `project`, are shared by identify v2 and v3. Previously
  the hardcoded documents had them combined and interleaved. Attempting
  to preserve this with autoprogram-cliff would have required
  significant additional infrastructure. However, since most readers
  care completely about one and not at all about the other, we instead
  split the v2 and v3 versions of these commands into separate pages. In
  case links to the old pages exist in the wild, they are preserved, but
  moved (with redirects) to a hidden directory, and populated simply
  with links to the new version-specific generated documents.

- The `federation domain` and `federation project` subcommands were
  previously absent from the docs. They are added. These are such small
  commands and they seem related, so they're put into a single document.

- Some pages were already being generated but were listing operations
  individually instead of using wildcards (possibly because they were
  created before wildcarding was supported by cliff). These are changed
  to use wildcarding. (We want to do this wherever possible as it is
  more future-proof in the event that more operations are added to a
  subcommand later.)

- The `service provider` document was incorrectly titled `identity
  provider`. Fixed.

Change-Id: I2030f9fe370038c5908b6eb6bed9692a73fe5067

This commit includes documentation about OSC
implementation for Manila.

bp openstack-client-support

Change-Id: Ic91a81e16e506103c08ef42ed0f8634a2b70e1dd

Congress and python-congressclient have been retired and also
removed from global requirements, thus requirements-check job fails.

Remove congress from this repo.

Change-Id: Ibf68fee49e69264a1c46b2f456901d2620befe3c

Switch to openstackdocstheme 2.2.1 and reno 3.1.0 versions. Using
these versions will allow especially:
* Linking from HTML to PDF document
* Allow parallel building of documents
* Fix some rendering problems

Update Sphinx version as well.

openstackdocstheme renames some variables, so follow the renames
before the next release removes them. A couple of variables are also
not needed anymore, remove them.

Set openstackdocs_auto_name to use 'project' as name.

Change pygments_style to 'native' since old theme version always used
'native' and the theme now respects the setting and using 'sphinx' can
lead to some strange rendering.

Depends-On: https://review.opendev.org/729744
Change-Id: Id3989cabdbf2204821531b00149aa0f1cb8a4955