packaging: setup: require java detection

Will be required after http://gerrit.ovirt.org/33410 is merged.

Change-Id: I0c4f1868f6d3fd71bae52fce4f05395f808c18d4
Signed-off-by: Yedidyah Bar David <didi@redhat.com>
(cherry picked from commit af8d472a55d9ea5234e8c5ccca23c2e0a07023b1)