Add mechanism to reliably migrate persistent timers to between TimerService implementations

[pferraro]

Description

Applications wishing to use the Infinispan-based TimerService have no mechanism to migrate any existing persistent timers created via legacy timer stores (e.g. database-data-store). This feature would add a source-data-store attribute to the /subsystem=ejb3/service=timer-service. When defined, the Infinispan-based TimerService will, upon EJB deploy, migrate existing timers from the source data store to Infinispan.

Issue Contact

pferraro