Update net-mgmt/collectd5 to version 5.6.0
- new port options CHRONY and MQTT
- disable disk plugin on FreeBSD 9.x due to missing OS files
- various patch changes
PR: 212832
Submitted by: ports@bsdserwis.com (maintainer)
Reviewed by: swills (mentor)
Approved by: swills (mentor)
Differential Revision: https://reviews.freebsd.org/D8028