[Buildbot] #2590: Use Alembic instead of SQLAlchemy-Migrate

[Buildbot trac]

#2590: Use Alembic instead of SQLAlchemy-Migrate
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Reporter:  dustin        |       Owner:
    Type:  project-idea  |      Status:  new
Priority:  major         |   Milestone:  0.9.+
 Version:                |  Resolution:
Keywords:  database      |
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Comment (by dustin):

 I anticipate a time when sqlmigrate no longer works, so I'd rather avoid a
 case where we continue to carry it as a dependency.

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Ticket URL: <http://trac.buildbot.net/ticket/2590#comment:18>
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