New review comment by heittpr on void-packages repository

https://github.com/void-linux/void-packages/pull/33393#discussion_r723797282

Comment:
I don't actually use `net-snmpd` myself, so these flags came from #29508 which I assumed to be decent defaults. A second read at the man pages actually suggests I was wrong.

- `-f` is indeed for foreground
- `-LSwd` and `-Lf` are both logging options, although I think a better default would be `-Lo`, that just logs to the standard output.
- the pid stuff can be removed too