devel/git-devtools: Simple Git tools from src/tools/tools/git

[jrm]

Summary

Rename from devel/git-arc to indicate that more tools from
src/tools/tools/git/ may be included. The only additional tool for now
is mfc-candidates, which, as the name suggests, is a tool to find MFC
candidates. Under a ports tree, mfc-candidates finds commits to merge
to quarterly.

Sponsored by: The FreeBSD Foundation

[markj]

I'd consider naming the port in such a way that it's clear it's for FreeBSD development, specifically. e.g., freebsd-git-devtools, or something like that.

[jrm]

Name the new port devel/freebsd-git-devtools

[markj]

Seems ok to me! Thank you.

[jrm]

Committed in 20f1605507e9a2be1c6aefa3aa65f47dbf31e283.