Remove the disable_upgrade_deployment flag validation
Remove the disable_upgrade_deployment flag validation

This flag is no longer used or expected in the roles_data so
we should remove the validation which is now confusing at best.

Change-Id: I4227f82168271089ae32cbb1f318d4a84e278cc7
Depends-On: Ib340376ee80ea42a732a51d0c195b048ca0440ac

openstack/python-tripleoclient