Trevor McCasland 6593986b34 Remove downgrade
Removed downgrade from all existing migrations.
Modified a test that verifies that no migrations have a downgrade.
Modified test _walk_versions to only do upgrades.
Removed exceptions from pylint.config

Related cross-project spec: https://review.openstack.org/152337
Closes-Bug: #1434103

Change-Id: I9a7c87ae3f4e2eff3a4a6df881d086d52062dbba
2016-10-06 16:57:41 -05:00
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2016-10-06 16:57:41 -05:00