In I75f087dc456c50327c3b4ad98a1f89a7e012dc68 we removed much of
the legacy upgrade workflow. This now also removes the
disable_upgrade_deployment flag and the tripleo_upgrade_node.sh
script, both of which are no longer used and have no effect on
the upgrade.
Related reviews
I7b19c5299d6d60a96a73cafaf0d7103c3bd7939d tripleo-common
I4227f82168271089ae32cbb1f318d4a84e278cc7 python-tripleoclient
Change-Id: Ib340376ee80ea42a732a51d0c195b048ca0440ac