install: move mysql configuration until after it has been installed as a dependency.

If mysql isn't already installed the `setup_mysql_service_rh` and
`restart_mysql_rh` functions fail.  Mysql is installed as a dependency in
`install_packages`, so move the functions after `install_packages`

Tested on a Fedora 18 ISO "minimal" install VM.
Not tested on debian.

Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>