Sqlite doesn't support dropping a column from a table. The
downgrade path for migration 016 performed this. So this commit adds the
sql file to perform the downgrade manually.
Change-Id: I6aae263c3aab03a383c47fd29c46f0cc9b857549
Glance is a project that defines services for discovering,
registering, retrieving and storing virtual machine images. Use the
following resources to learn more: