WHISTLE-1441: rotate the webseq log on startup (if needed)
WHISTLE-1441: add logging for when node connection handlers fail
WHISTLE-1441: load default # of queue workers from system_config
WHISTLE-1441: update webseq text
WHISTLE-1441: update webseq messages
WHISTLE-1441: set the agent_handling stat explicitly, stop setting it at the end of the call by the queue stat, and don't update agent status when seeing the call_partial's handling stat