Fix mysql element on Fedora 19

mysqld.service needs to be explicitly referenced, due to a bug
with systemd and symlinked service files
(https://bugzilla.redhat.com/show_bug.cgi?id=1014311)

Change-Id: Ica56c5234a600db132a85cd3b1d83ee0c6c6d573
Closes-Bug: #1275756
Merge "Fix mysql element on Fedora 19"