$namespace = openstack.network.v2

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.

This one turned out to be quite involved, because we support both
neutron and nova-network. When running in a real cloud, the command
classes detect whether the neutron service is present, assume
nova-network if that service is not found, and only add parser options
relevant to the detected service. But the docs need to present both sets
of options. This was easy enough when they were hardcoded, but required
a bit of additional infrastructure for generated docs.

Change-Id: I426261eb1d86bcc68656aabd61f10b7f082da402

Add a set of exclusive parameters to the Network QoS policy:
  --default: makes this policy the default policy for
             the project to which the qos policy belongs.
  --no-default: unset the property.

Closes-Bug: #1639220
Depends-On: If5ff2b00fa828f93aa089e275ddbd1ff542b79d4
Depends-On: Ibe7b7881cb190bfd5582f35b6de51a8bc21135de
Change-Id: I0269b837dc29bbd8ee2089d847cadb72d800fa30

Move existing content around based on the doc-migration specification.

Replace :doc: markup with :ref: to have sphinx keep track of where the
files move and generate valid hyperlinks.

Add a few toctrees and index pages for the new directories.

Depends-On: Ia750cb049c0f53a234ea70ce1f2bbbb7a2aa9454
Change-Id: I253ee8f89d3ec40e39310c18bb87ed1d3d5de330
Signed-off-by: Doug Hellmann <doug@doughellmann.com>