Revert logic changes in ovirt-functions.in

The installer doesn't like it if the CD liveos is mounted on
/liveos. Don't do it.

Change-Id: Iaa8069299df6d1c77020f3e88ff7bdcb8f25b8bd
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1120650
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1095081
Signed-off-by: Ryan Barry <rbarry@redhat.com>