change version from 1.6 to 2.0
change version from 1.6 to 2.0

Change-Id: Id297936cd43c138375247c5e36ac3d7e79a22bea

rahulunair/kolla,stackforge/kolla,openstack/kolla,stackforge/kolla,rahulunair/kolla,stackforge/kolla,openstack/kolla