Check nova v2.2 in gates
Check nova v2.2 in gates

V2.2 microversion extends keypairs in Nova. This patch check that this
microversion works.

Change-Id: Ifaa7826f100bb918f53a7cac451ba577d3d29b69

amit0701/rally,vganapath/rally,amit0701/rally,gluke77/rally,eonpatapon/rally,openstack/rally,eayunstack/rally,eayunstack/rally,openstack/rally,paboldin/rally,amit0701/rally,openstack/rally,group-policy/rally,yeming233/rally,gluke77/rally,group-policy/rally,group-policy/rally,paboldin/rally,eonpatapon/rally,gluke77/rally,gluke77/rally,openstack/rally,vganapath/rally,vganapath/rally,vganapath/rally,eayunstack/rally,yeming233/rally,paboldin/rally