Pull docker images from global registry

The global docker registry is where images are
being built and uploaded. It's effectively docker's
version of, say, 'pip'. The static tarballs are
not only an extra maintenance burden as they're outside
the standard build and publishing process, but are presently
outside the scope of an open development / release
process as well.

While this process does cause some trouble with
network-independence for CI purposes, the fetching
is still done from install-docker.sh; Additionally,
this driver is not currently tested via the community CI effort.

Change-Id: I3ee6bfee9c273cd3aabe1e00a1d1a8856a466189
use ext4 for guest default ephemeral

this isn't upstream default because of compatibility questions
with really old host on providers. However there is no reason not
to do it in devstack.

Change-Id: I6438c0efb297cfa5d3dbb5f00701b24f01c39d14
Merge "use ext4 for guest default ephemeral"
Have ceilometer to respect the keystone settings

lib/ceilometer ignored the global settings related to keystone settings.

It can cause issues for example when the keystone does not listen on
127.0.0.1 even in single node deployment.

Change-Id: I6e4654daa2ec624ac11aaf7f49495fcfaa72071d
bash_completion for heat and ceilometer

Installing bash completion for heat and ceilometer by using a
similar way used with other services.

Change-Id: I5094648272f2666f6bff181bfa3aeb35e863bd97
Merge "Have ceilometer to respect the keystone settings"
Merge "Pull docker images from global registry"