FreeBSD/src 1e62ece (r355750)contrib/netcat netcat.c nc.1, usr.bin/nc Makefile

Add -M option to nc(1), which makes it print the TCP connection
statistics obtained with stats(3) in JSON format to standard error.

Reviewed by:    allanjude, thj, cem (earlier version)
Tested by:      thj
MFC after:      2 weeks
Relnotes:       yes
Sponsored by:   Klara Inc.
Differential Revision:  https://reviews.freebsd.org/D21324
DeltaFile
+99-5contrib/netcat/netcat.c
+8-2contrib/netcat/nc.1
+7-0usr.bin/nc/Makefile
+114-73 files

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