Adding yum latest requirement

Old yum versions have issues with the groups:

https://bugzilla.redhat.com/show_bug.cgi?id=1063941

needed to test the upgrades, newer verisons have it fixed.

Change-Id: I93d03de9d31fb57af2684ae39557adfc5b5d5e14
Signed-off-by: David Caro <dcaroest@redhat.com>