KAZOO-243: try to bind to FreeSWITCH event streams a couple times
KAZOO-243: connect to incoming leg (not outbound leg to group device)
KAZOO-243: filter unknown fields from channel results
KAZOO-243: cf_exe should listen for control usurps
KAZOO-243: publish usurps with new fetch-ids
KAZOO-243: cleanup when to stop ecallmgr_call_control due to redirect