[Bug 199976] [patch] implement xargs -P0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199976

            Bug ID: 199976
           Summary: [patch] implement xargs -P0
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: lifanov at mail.lifanov.com
          Keywords: patch

Created attachment 156407
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=156407&action=edit
xargs: implement -P0

This simple patch implements GNU-like xargs -P0 to run "as many processes as
possible". This option is convenient and allows many of my scripts to port.

There are a couple of differences from GNU behavior to make this consistent
with other options in our xargs: -P takes negative numbers, which mean the same
as -P0, and the maximum number of procs is equal to maxargs rather than some
*_MAX macro. This is probably what the user wants, performs a lot better, and
doesn't hurt intended -P0 portability.

Tested with: kyua test -k /usr/tests/Kyuafile usr.bin/xargs (passed)

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