Added debug logging for socket write events.
PT40997051 - sipXsaa deadlocks during a 10 cps test harness run

Partial fix for sipXsaa deadlocking issues:
- reorganized some locks/unlocks in SipSubscribeClient to prevent a deadlock between ::handleNotify and ::addSubscribe;
- reorganized and added locks in AppearanceGroupSet to protect access to several lists (similar with the locks from RLS);
- adjusted all the delays, removed some delays from SAA according to the ones from RLS;

After these changes BLA still deadlocks but it takes longer to deadlock and it deadlocks in another location - the consumer
thread of the internal queue also post into the queue and because it is slow it deadlocks the queue.
Polycom 4.0 firmware support.
PT-41768247 fixed bug allowing Poly phone fw to be updated to unsupported fw version via group fw setting
PT-41767515 - added back support for pre 3.1 models - 300 and 500; fixed a few bugs, and improved logging.
Merge remote-tracking branch 'remotes/origin/release-4.6-updates' into release-4.6-updates-polycom-1
Merge branch 'release-4.6-updates' into release-4.6-updates-polycom-1
Merge branch 'release-4.6-updates' into release-4.6-updates-polycom-1
Merge remote-tracking branch 'origin/release-4.6-updates' into release-4.6-updates-polycom-1
PT-41605529 - fixed bug in provision servlet preventing autoprovisionned phones to pick up config
Merge remote-tracking branch 'origin/release-4.6-updates' into release-4.6-updates-polycom-1
Plycom: added in master config model support for 601,300,500, left aside by mistake
Merge branch 'release-4.6-updates-polycom-1' of github.com:dhubler/sipxecs into release-4.6-updates-polycom-1
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.
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.
Revert "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 14563c008d7e2ead8566df06a09caef67ef7d5e9.
Merge branch 'release-4.6-updates' of ssh://github.com/dhubler/sipxecs into release-4.6-updates
PT-42056707 ability to choose correct model for selected polycom models: phones that were defined in pairs (300/301, etc)