Actually run baremetal migration tests.

The baremetal migration tests weren't being run because the test lookup
code was looking for a tests of form 'check_#' instead of 'check_###'.

Change-Id: I8f162d6493dd09b2d0cff36c40ae9acc5df1269c
BM Migration 004: Actually drop column

SQLAlchemy-migrate appears to support passing in a Column or a
column-name string into `drop_column`. In practice though, only the
column-name form actually works.

Change-Id: I1bcc28511d652df44f7168fb84c8be7dacd60cfd
Merge "Actually run baremetal migration tests."
Merge "BM Migration 004: Actually drop column"