engine: Add FreeBSD 9.2 to the list of OS types

FreeBSD 9.2 works well as a virtual machine in oVirt.  Add this OS to
the list of operating system types so a user may select it and be
confident when installing FreeBSD 9.2

Signed-off-by: Adam Litke <alitke@redhat.com>
Change-Id: I268baa654e16e7e020024943632b09d5cc06a963
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1040088