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Per our PTG resolution [1] and general OpenStack resolution [2], lower-constraints are not worth the extra work and confusion they introduce. This patch drops them along with all mentions. [1] http://lists.openstack.org/pipermail/openstack-discuss/2020-October/018445.html [2] http://lists.openstack.org/pipermail/openstack-discuss/2020-December/019521.html Change-Id: I4c65a428facdf6d4ce28d97a868589aeae4c856e