[Observium] FreeBSD ports - Observium CE update to

Folks,

The FreeBSD port has been updated to Observium CE 0.16.1.7533; along with a whole bunch of extra/updated dependencies.

This also makes the migration/activation to the professional version pretty much a ‘drop in’ now & makes the polling more efficient.

SNMP internal mode is expressly disabled (it seems to suffer from the same issue as on fedora - some substitution issue).

Thanks,

Dw.