doc: require openstack client change for every new API microversion
doc: require openstack client change for every new API microversion

To avoid widening the gap between novaclient and openstack client we
require to add support for each new microversion in both clients.

Change-Id: I136cae2ea0b2f59c46d999569998e80ec5d4f24d

mahak/nova,openstack/nova,mahak/nova,openstack/nova,mahak/nova,openstack/nova