Remove transition related to RELEASE msg
Partial work of service model of Lock (to be verified)
Add interfaces message between Slaves and Controller
Complete LockService model. Assertion check for unexpected input.

The edges are not marked here, so it is still not possible to make sure every edge is traversed.
Complete the 6-state service model. All transitions are traversed.

consider have multiple states on reset edge to account for simultaneous ‘free’ messages from the merging car, front car, and the back car.
Bug fix 131127: Controller ignores ‘success’ message.
Bug fix 131127-2: Correct the criterion in LockService::isMonitored(); accepts msg ‘free’ from m, f, and b.
Simplify controller; deadline generation migrated to class Sync, conforming to the new version of ProbVerify
exposes interface messages