Add better status to baremetal deployments.

This patch introduces a few new baremetal states, which are used to
track the deploy process. Now, nova-baremetal-deploy-helper updates the
bm_nodes record directly when it begins and finishes deploying an image
to that node.

The next patch will add a LoopingCall inside driver.spawn() to wait for
the deploy to complete.

Also, since there can not be >1 active deployment per node, there
is no need to have a separate table for storing them. This patch drops
the table bm_deployments and adds the important information it contained
to bm_nodes. Since the previous behavior was to mark a deployment as
deleted once it completed, there is no need to copy any data from
bm_deployments prior to dropping the table -- assuming that no active
deployments are in process when the migration is run.

Since this is the first migration for the baremetal database, it also
adds a new test class, TestBaremetalMigrations, and refactors the
test_migrations.py file to allow for multiple test classes.

partially implements fix for bug 1096723

Change-Id: Iad30b462d49c88fc19babed43a2fb8540b1fad30

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