Add cleanup migration for indexes.

There are a lot of extra indexes in database (for primary key).

bp: ceilometer-db-sync-models-with-migrations

Change-Id: I44d569de81f078aef27451382baf0a3061f38be2
Fix missing foreign keys.

There are a lot of ForeignKey that had been skipped in database but
declared in models.
This migration adds them.

bp: ceilometer-db-sync-models-with-migrations

Change-Id: I3e34c3e87b3d3df63971fe9994afc63fe27594f8
Merge "Add cleanup migration for indexes."
Merge "Fix missing foreign keys."