Replace dict.itervalues() with dict.values()
Replace dict.itervalues() with dict.values()

Change-Id: I49c6af5ce47056ea513138545ff80467b90aa1de
Partially-Implements: blueprint support-python3

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