Bug 956667 - Updated MySQL v2 cart to install with oo-admin-cartridge in...

... %post

https://bugzilla.redhat.com/show_bug.cgi?id=956667

Updated cartridges/openshift-origin-cartridge-mysql/openshift-origin-cartridge-mysql.spec
to install the cartridge with oo-admin-cartridge in %post, this
replicates identical behavior in the other v2 cartridges.