Remove unused package dependencies

* /sbin/vconfig command is not used by either nova or neutron.
* Now the AMQP carrot is not used, not even optionally by
  the oslo.messaging.
* python-gfalgs just referenced as a similar configuration style,
  by neutron.

Change-Id: Idde5446e47e7da1dd204ea518ab816e2cce77c7d
XenAPI:  Find location for XenAPI plugins

Plugins can be installed in different places in dom0; re-enable the
use of xapi_plugin_location

Change-Id: If94ec6b250ad5b4f7730cfbf443d937eb85feb5c
Update openSUSE-13.1 dependencies

The package libxml2-python was replaced by python-libxml2 since 12.2.
Rather use mariadb instead of mysql-community-server since the package
receives far more attention.

Change-Id: I8514048d05731750684862aa1e94331d7f602b68
cinder_driver_certs.sh always passes driver

In cinder_driver_certs.sh, the tests are run and output is
piped to "tee".  Currently, checking the exit code of this
command only checks that "tee" exited properly.  Using the
pipefail option for this script will ensure the entire
pipe succeeds before passing a driver.

Change-Id: I58311aa0e2c779467d39c4477c4ea39d14eda207
Closes-Bug: #1289129
Merge "Update openSUSE-13.1 dependencies"
Merge "Remove unused package dependencies"
Merge "cinder_driver_certs.sh always passes driver"
Merge "XenAPI:  Find location for XenAPI plugins"
Merge branch 'master' of https://github.com/openstack-dev/devstack