Move step methods to StoreAdapter
Get StoreAdapter through Store instead of direct construction
Helper method for adapter creation
Rename enum for generality
Use abstract interface
Use abstract interface in update ITs
Use generic adapter in ITs and CTs
Override createAdapter in OperatorStore
Restore explicit PersistitAdapter usage for alter path
merge nwilliams: Use Store for creating StoreAdapter when possible.

https://code.launchpad.net/~nwilliams/akiban-server/store-adapter-creation/+merge/167339
Track addition of identity via ALTER TABLE ADD COLUMN.
Enhance test to track sequence changes.
Add a test for the new case.
merge mmcm: Track added sequence when ALTER TABLE ADD COLUMN adds an identity column.

https://code.launchpad.net/~mmcm/akiban-server/alter-table-add-identity/+merge/167435