RFE: support the -f option for iputils arping compatibility about arping

[ThomasHabets]

arping is at risk of running out of letters in the alphabet for options. So unless there's a specific problem this is adressing (the feature already exists, as you say, with -C 1) I'd say better to skip.

[scop]

The specific problem of incompatible arguments does exist.

GhostofGoes/getmac#52 (comment)
https://github.com/GhostofGoes/getmac/blob/master/getmac/getmac.py#L391

Being able to return as quickly as possible is very much a goal there, but cannot be cleanly achieved in a way that works with both arping variants.

[ThomasHabets]

If -C here is a superset of -f, why not add -C to the other arping instead?