Revert "packaging: spec: support distro without jboss-as 7"

This reverts commit 4fa587aafad100cb3a79e834e0f0e554758c9d64.
It cause upgrade to fail on CentOS.
Fixes have been pushed in http://gerrit.ovirt.org/28108 
and http://gerrit.ovirt.org/28102 but not reached consensus.
So reverting the change.

Change-Id: Icf74d84511cf436c3176ccf5131be2b1558c4499
Realted-To: https://bugzilla.redhat.com/1055604
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>