Based on the change in Keystone Install Guide [1],
this patch replace port 35357 with 5000 for "auth_url".

For more details, please check similar changes which have been done
on other projects: Nova [2], Neutron [3], Cinder [4], Glance [5].

[1] https://review.openstack.org/#/c/541857
[2] https://review.openstack.org/#/c/562812
[3] https://review.openstack.org/#/c/566491
[4] https://review.openstack.org/#/c/565464
[5] https://review.openstack.org/#/c/558932

Change-Id: I4faabbb107f912c7ed1cc5d3467ea5a94197d4a0

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>