Updated openstack/openstack
Project: openstack-dev/devstack  0daf26b880d16830c0bfcc0401ac31abeaacbdd8

Fedora mysql log dir is /var/log/mariadb

/var/log/mysql does not exists on f20, f19, rhel7 by default,
but the /var/log/mariadb exists.

Change-Id: I0def3eaead491a00e6f8467db6b31502b9376188