reduce likelihood of order collisions in OrderedSet tests
reduce likelihood of order collisions in OrderedSet tests

Change-Id: I964f3e1958e86e8e34abc87111e6beb60a569609

ramineni/my_congress,ekcs/congress,ekcs/congress,ekcs/congress,ramineni/my_congress,ramineni/my_congress,ekcs/congress,ramineni/my_congress,openstack/congress,openstack/congress