[Bug 233588] flip-flop test case: usr.bin.procstat.procstat_test.environment

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233588

--- Comment #2 from commit-hook at freebsd.org ---
A commit references this bug:

Author: jilles
Date: Wed Sep  4 16:25:42 UTC 2019
New revision: 351819
URL: https://svnweb.freebsd.org/changeset/base/351819

Log:
  procstat/tests: Fix flakiness by waiting for program to start

  Some of the procstat tests start a program "while1" and examine the process
  using procstat, but did not wait properly for it to start (kill -0 will
  succeed immediately after the child process has been created).

  Instead, have "while1" write something when it starts, and use a fifo to
  wait for that.

  PR:           233587, 233588
  Reviewed by:  ngie
  MFC after:    1 week
  Differential Revision:        https://reviews.freebsd.org/D21519

Changes:
  head/usr.bin/procstat/tests/procstat_test.sh
  head/usr.bin/procstat/tests/while1.c

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