Enable Boost to utilize multiple processes

[browniebraun]

Describe the bug

Cacti offers the option to configure concurrent boost update processes, but there is no functionality behind this option.

Screenshots

[netniV]

I believe this is one that is already known to @TheWitness

[browniebraun]

yep, but I wanted to give him a reminder. ;)

[TheWitness]

I know, I know. Never enough time in a day.