KAZOO-2282
Merge branch 'KAZOO-2282' of https://github.com/onnet/kazoo into onnet-KAZOO-2282
KAZOO-2282: add crossbar hooks for maybe archiving MODbs
KAZOO-2282: conditionally archive via crossbar cleanup hooks
KAZOO-2282: add archiving check, archive to file, and remove archived db
KAZOO-2282: add archiving sup command
KAZOO-2282: add specs/docs