Fedora 18 changes the way how to work with services in spec files. It introduces new macros - %systemd_post, %systemd_preun and %systemd_postun; which replace scriptlets from Fedora 17 and older (see https://fedoraproject.org/wiki/Packaging:ScriptletSnippets#Systemd, https://bugzilla.redhat.com/show_bug.cgi?id=850016).
I'm disinclined to introduce differences in the spec files for the active Fedora branches for purely cosmetic reasons, and at the moment this seems purely cosmetic. If these macros got back-ported into F17 and F16 so that the spec files could remain the same, I'd be considerably more willing to adopt them now.
mysql-5.5.28-1.fc17 has been submitted as an update for Fedora 17. https://admin.fedoraproject.org/updates/mysql-5.5.28-1.fc17
mysql-5.5.28-1.fc16 has been submitted as an update for Fedora 16. https://admin.fedoraproject.org/updates/mysql-5.5.28-1.fc16
mysql-5.5.28-1.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/mysql-5.5.28-1.fc18
Package mysql-5.5.28-1.fc18: * should fix your issue, * was pushed to the Fedora 18 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing mysql-5.5.28-1.fc18' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2012-15119/mysql-5.5.28-1.fc18 then log in and leave karma (feedback).
Bodhi hasn't close this bug, doing it manually.