packaging: setup: validate jboss after yum upgrade

jboss may be updated while upgrading ovirt-engine,
so jboss home should be checked only after upgrade.

Change-Id: Ifbfde5a28ef8d2c3ed421ffe4d9b733ae5abe1be
Bug-Url: https://bugzilla.redhat.com/1106392
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>