Description of matchmaker configuration options

Configuration option = Default value	Description
[DEFAULT]
matchmaker_heartbeat_freq = 300	(IntOpt) Heartbeat frequency.
matchmaker_heartbeat_ttl = 600	(IntOpt) Heartbeat time-to-live.
[matchmaker_ring]
ringfile = /etc/oslo/matchmaker_ring.json	(StrOpt) Matchmaker ring file (JSON).