KAZOO-1925: hook up the disconnect interface for Vitelity
KAZOO-1926: update formatting/specs
KAZOO-1925: move common vitelity functionality to util module
KAZOO-1925: vitelity e911 integration
KAZOO-1923: clean up spec
KAZOO-1925: add clause for empty list, update type
KAZOO-1925: fix specs, bad function call, cleanup