Modernize the examples on using the CLI to authenticate with an external
IdP or keystone IdP, add tips on how to get needed information, and add
examples on authenticating with horizon.
Partial-bug: #1793374
Change-Id: Ieec899a1551be69da232196c59b9aeed0e85f5f5
This introduces a feature support matrix to illustrate which of our
various token providers supports which API operations and features. This
is intended to mirror Nova's feature support matrix documentation page,
found here:
http://docs.openstack.org/developer/nova/support-matrix.html
After running `tox -e docs`, the result is embedded in
`doc/build/html/configuration.html`.
Change-Id: I3dc896a2906e25827a9e01afc7de5a737831c336