pacakging: bump rpm release to 2

Bump release in order to force upgrade of current public RPM

Bug-Url: https://bugzilla.redhat.com/1019391
Change-Id: Id831ff88d14f0d785b7f4d4cba270f3d950aa9f1
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>