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netstat -i: do not truncate interface names

Authored by karels on Jul 3 2022, 8:18 PM.
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The field for interface names for netstat -i was 5 characters by
default, which is no longer sufficient with names like "vlan1234"
and "vtnet0". netstat -iW computed the necessary field width, but
also enlarged the name field by a lot (especially with IPv6 enabled).
Make netstat -i compute the field width for interface names with or
without -W. Note that the existing default output does not fit in
80 columns in any case. Update the man page accordingly, documenting
the remaining effect of -W with -i. Also add -W to the list of
General Options, as there are numerous pointers to this.

Test Plan

tested on systems with longer interface names, including vtnet0

Diff Detail

rS FreeBSD src repository - subversion
Lint Passed
No Test Coverage
Build Status
Buildable 46240
Build 43129: arc lint + arc unit