Revert "PT-41548187:  Added new constructor to OsTimer to allow functor callbacks for OsMsg instead of message queues.  Revised thread pool to use a vector."

This reverts commit 8f261e39d3f00d21c0a67194e8d65766d9ed0a59.
Revert "PT-41548187: Revised sip timers to use boost functor callbacks instead of the message queue for faster execution.   Revised garbage collection to delete transactin in COMPLETED state earlier.  Previous configured default is 5 minutes which allows transactions to pile up before the garbage collector kicks in."

This reverts commit 2ae2f49398cf252ba801a5f5652cc79d2997a65a.