Bump the silverberg version
Add with_lock call to otter.controller.maybe_execute_scaling_policy with accompanying tests
Clean up the store after a run of RestAPITestMixin
Use *args in addCleanup
Merge from trunk, resolve conflicts
Revert changes to controller
More reverting of my previous changes
Add with_lock to CassScalingGroup.modify_state, with accompanying tests
Fix thinko in test
Add docstring to pass lint; also, actually *use* the parameters
Add locking to scaling group deletion.
Have 'modifier' callback raise, to ensure it doesn't get called.
Remove superfluous comment (as requested by Ying)
Make the table name a variable
Add cql query for creating the lock table.
Update LOCK_TABLE_NAME
Merge pull request #233 from rackerlabs/auto-219-locks

Auto 219 locks