Adjust authentication.rst doc to reference "identity_uri"

The "auth_port", "auth_host", and "auth_protocol" variables were
deprecated in favour of a single "identity_uri" variable.

* Adjust authentication.rst doc to reference "identity_uri"

Change-Id: I48de53f21b8d767b276858ed274066015d765f0e
Closes-Bug: #1361613
Fix options and their groups - etc/glance-api.conf

As per the docs at [0] , some of the options should have been moved
around in the etc/glance-api.conf. This patch changes the conf file to:

    1. indicate new default values
    2. change the group of some of the configs in order to adhere to
       new groups as expected by the deployer.
    3. deprecated configs have been removed or replaced with new ones.

[0] http://docs.openstack.org/trunk/config-reference/content/glance-conf-changes-master.html

Fixes bug: 1380689

Change-Id: I5b5ab96b050b502007e6660a7a613e252404d4e8
Merge "Fix options and their groups - etc/glance-api.conf" into proposed/juno
Don't access the net while building docs

(Note this hasn't been submitted upstream)

Change-Id: I42c6e3a5062db209a0abe00cebc04d383c79cbcb
(cherry picked from commit f2b4bb4e45afcc178200966193a7b87401c534d7)
Remove runtime dep on python pbr
avoid unsupported storage drivers
notify calling process we are ready to serve

Systemd notification should be sent in-process, otherwise systemd might
miss the subprocess sending notification.
See systemd bug https://bugzilla.redhat.com/show_bug.cgi?id=820448

Taken from keystone project commit
abc06716d027d68f0da3b0f559fa7c85a21804d5

Improvements from Keystone version:

    * add unset_environment parameter
    New parameter unset_environment was added to sd_notify
    http://www.freedesktop.org/software/systemd/man/sd_notify.html
    to ensure service readiness is sent only once.

    * add onready() method to simulate systemd environment
    For testing purposes and optional use with SysV initscripts.

    * unit test added

    * docstrings for notification methods

Patch includes deployment in openstack.common.service.
It does not have an effect when running the service outside
the systemd environment.

Implements: blueprint service-readiness
Change-Id: I80f325c9be9c171c2dc8d5526570bf64f0f87c78