rescue: Add fetch(1) to the rescue tool.
After a failed upgrade, having fetch(1) on a system that is physically unnreachable would be very useful to download files required to get the OS back up and functional. On my system this adds 589,824 bytes (3.8%) to the binary size. PR: 266224 Reported by: Dan Mahoney MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D38193main
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