[Bug 292262] netstat: numerous space-padded fields in JSON output

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292262

            Bug ID: 292262
           Summary: netstat: numerous space-padded fields in JSON output
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: asomers@FreeBSD.org

netstat has libxo support.  But its encoded output forms include numerous
fields with space-padding where it doesn't belong.  For example:

$ netstat -c -p tcp -n --libxo=json,pretty | grep stack | sort | uniq
        "stack": "bbr    "
        "stack": "freebsd"


The common pattern in the code is xo_emit calls with field-format specifiers
that include strings with widths, and no encoding-format specifiers.  For
example, the above lines were caused by:

xo_emit(" {:stack/%-*.*s}",

Most such instances can be caught by this regex:
"xo_emit[^/{]*\{[^}/]*/[^}/]*\}".  There are hundreds.

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