KAZOO-3050: maint functions to limit and hangup long-lived channels
KAZOO-3050: periodically check for long-lived channels, hanging them up
as appropriate
KAZOO-3050: only select used fields to avoid copying whole record from ETS
KAZOO-3050: cleanup dialyzer warnings
KAZOO-3050: only hangup channels being handled locally
Merge pull request #675 from 2600hz/KAZOO-3050

Kazoo 3050