Rename variables to avoid collisions
Delete unnecessary code.
HORNETQ-1102 Take the locks in the right order.
clean up tests: fixing warnings and clean up issues
Use constructor argument for config URL.

Leaving method setConfigurationUrl() in place, as it is used in
HornetQFileConfigurationService, which is necessary for AS4 support.
We should determine that in HORNETQ-1107.
Move Journal Record IDs constants into its own class.
delete unused helper classes
Remove some methods from Transaction interface.