Install gettext from apt on Trusty (Ubuntu 14.04)

The binary 'msgfmt' is not installed as part of python-gettext for Trusty
(Ubuntu 14.04), so gettext needs to be installed from apt.

Change-Id: I415814559d82be453e978a0d92a0cdb38f105683
Closes-Bug: 1331328
devstack.org site updates

Includes:
* Change Precise to Trusty
* Add the new plugin phase
* Remove deprecated config options
* much, much more

Change-Id: I0385f18a3256ad37a611e505e49572f27b3bcc10
XenAPI: Fix declare definition

Some versions of bash do not initialise a variable with declare -a
therefore with set -u bash can terminate the script.

Be more verbose in declaring the array if it is not set

Change-Id: I6ec2b6e986aeffe539a2ab93432fa7af9e5a4f5d
Merge "XenAPI: Fix declare definition"
Merge "Install gettext from apt on Trusty (Ubuntu 14.04)"
Merge "devstack.org site updates"