Fix package script for rhel finals
Fix package script for rhel finals

The release piece was being calculated wrongly, resulting in RPM
packages not conformant to spec.

Signed-off-by: Galo Navarro <993a0c35b28faad02772940a5764c74e22075164@midokura.com>

midonet/python-midonetclient,midonet/python-midonetclient,midokura/python-midonetclient,midokura/python-midonetclient