db test migration with alembic

Registered by Pierre Padrixe (stannie)

The current implementation of test_migration (https://github.com/openstack/oslo-incubator/blob/master/openstack/common/db/sqlalchemy/test_migrations.py) is not available for alembic.
Several projects (Ironic, Storyboard, Sahara, ...) are using a modified test_migration ported to alembic.

We should provide a generic implementation to manage alembic and migration libraries (e.g: Nova doesn't use alembic)

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Pierre Padrixe (stannie)
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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