pacakging: bump rpm release to 2

Bump release in order to force upgrade of current public RPM

Change-Id: Id72b57ab6ebe4cee1eb1087bd7157a5e902c895a
Bug-Url: https://bugzilla.redhat.com/1050084
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>