Mariadb won't startup on Fedora 21

[Dan Prince]

Trying to use Fedora 21 with tripleo-image-elements mariadb elements fails:

Mar 05 15:11:44 localhost.localdomain.localdomain systemd[1]: Starting MariaDB 10.0 database server...
Mar 05 15:11:44 localhost.localdomain.localdomain mysqld_safe[8773]: 150305 15:11:44 mysqld_safe Logging to '/mnt/state/var/log/mysql/error.log'.
Mar 05 15:11:44 localhost.localdomain.localdomain mysqld_safe[8773]: mkdir: cannot create directory ‘/var/run/mysqld’: Permission denied
Mar 05 15:11:44 localhost.localdomain.localdomain mysqld_safe[8773]: Fatal error Can't create database directory '/var/run/mysqld/mysqld.sock'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/161836

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/161836
Committed: https://git.openstack.org/cgit/openstack/tripleo-image-elements/commit/?id=ea58fd7ecbe9038cbe95be1ff063a7c059907088
Submitter: Jenkins
Branch: master

commit ea58fd7ecbe9038cbe95be1ff063a7c059907088
Author: Dan Prince <email address hidden>
Date: Thu Mar 5 13:55:48 2015 -0500

    Create Fedora 21 softlink for /var/run/mariadb

    ln -sf /var/run/mariadb/ /var/run/mysqld (if required)

    This fixes mariadb startup issues on Fedora 21.

    Change-Id: Iff53e3bce3d5ffdf9006d0576f328ae99fa3da4e
    Closes-bug: #1428783