WHISTLE-1832: set syslog default log level to info, and add helpers in wh_util for changing the various log levels for the various backends
WHISTLE=1832: update all callflow log lines to info level
WHISTLE-1832: update trunkstore log lines to log at the info level
WHISTLE-1832: updated log lines and specs in various callflow modules
WHISTLE-1832: update specs and logging levels/messages