eliminated ServiceRegistryImpl dependency on TransactionalObject - getOrCreateRegistration() now throws Interrupted & Deadlock exceptions
eliminated Registration dependency on TransactionalObject - new Registration.lockWrite() method reports exceptions instead of throwing them because this code is called indirectly via executors
Eliminated ServiceControllerImpl dependency on TransactionalObject.
 * TransactionalObject have been eliminated completely with this commit.
 * All useless test utilities have been eliminated, namely
   - DisableRegistryTask
   - DisableServiceTask
   - EnableRegistryTask
   - EnableServiceTask
   - RemoveRegistryTask
   - RemoveServiceTask
   - ShutdownContainerTask
 * ServiceRegistryImpl was fixed to be locked whenever its internal state is going
   to be changed, that is not only during creating new Registration object, but also when
   enabling, disabling or removing the registry.
 * ServiceControllerImpl introduced two locking methods
   - writeLocked() this method propagates DeadlockException & InterruptedException upstack
                   because it guards publicly available API methods users can call
   - writeLockedSilently() this method reports problem via transaction report, because
                           it guards internal methods that are executed via executor threads
                           This method provides fast fail detection (via boolean return flag),
                           allowing us to terminate processing once problem have been detected.
 * API have been updated to throws DeadlockException & InterruptedException where appropriate.