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TimerQueueProcessor to scan DB for exisiting timers on init (#455)

* TimerQueueProcessor to scan DB for exisiting timers on init

TimerQueueProcessor used to setup a very long timer on initialization to
notify processor for doing a DB scan.  This becomes problematic when you
have existing timers and shard restarts.  Now after initialization of
shard there is no trigger for the processor to perform a DB scan.  It
now has to wait for a trigger from outside to perform the first scan so
it can start operating as usual.
This change removes the infite timer on initialize to perform first scan
immediately to check for existing timers.
Also some code cleanup and removing some unnecessary code.

fixes #454

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