Add support for django_openstack_auth

It would be useful for development, reviewing and testing to add
support for django_openstack_auth to devstack.

This change adds the integration tests to the openstack_auth
list of test: https://review.openstack.org/#/c/86528/

Change-Id: Ifbd336b83f6b2beb23996b599ec820232c13efdd
Closes-Bug: #1262121
Use Keystone's default token format if not set

Devstack was setting its own default for Keystone's token format, so
when Keystone's default token format changed then devstack needed to
be updated. With this change, devstack will only override Keystone's
token format if KEYSTONE_TOKEN_FORMAT is set explicitly. PKI setup
is assumed to be needed unless the KEYSTONE_TOKEN_FORMAT is set to
UUID.

Change-Id: Idfa78e93abd80273dadcf37007a024bb6a783a48
Glance: start to use nova's glance configuration section

Commit 4b6e75b5f8037adbf63ac2f03dca17f0c8c0bc08 added support
of a neutron section. This updates the code to make use of
that section.

Change-Id: Ib9a0f2aeb0d91adeb567f79917804f0a89fdb6e1
Move static docs into master branch

The hand-maintained static HTML docs for DevStack have been in a
GitHub gh-pages branch; move them into the master branch in
preparation for hosting them in openstack.org infrastructure.

By default tools/build_docs.sh now builds the static HTML output
into docs/html.

Change-Id: Ide5f7d980a294c7a9f8a3decaed0939f1c239934
add worlddump tool to devstack

when we exit poorly, start building a tool for doing a capture
as to why. This tool is expected to be consumed directly from
grenade as well.

Change-Id: Ia1bc1c2e259587035ca7252baceec25fa464cb82
Merge "Add support for django_openstack_auth"
Merge "Glance: start to use nova's glance configuration section"
Merge "add worlddump tool to devstack"
Merge "Move static docs into master branch"
Merge "Use Keystone's default token format if not set"