[Bug 247559] Flakey test case: bin.sh.execution.functional_test.bg12

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247559

--- Comment #4 from commit-hook at freebsd.org ---
A commit references this bug:

Author: jilles
Date: Sun Jun 28 21:15:29 UTC 2020
New revision: 362737
URL: https://svnweb.freebsd.org/changeset/base/362737

Log:
  sh/tests: Fix flaky execution/bg12.0

  When job control is not enabled, the shell ignores SIGINT while waiting for
  a foreground process unless that process exits on SIGINT. In this case, the
  foreground process is sleep and it does not exit on SIGINT because the
  signal is only sent to the shell. Depending on order of events, this could
  cause the SIGINT to be unexpectedly ignored.

  On lightly loaded bare metal, the chance of this happening tends to be less
  than 0.01% but with higher loads and/or virtualization it becomes more
  likely.

  Starting the sleep in background and using the wait builtin ensures SIGINT
  will not be ignored.

  PR:           247559
  Reported by:  lwhsu
  MFC after:    1 week

Changes:
  head/bin/sh/tests/execution/bg12.0

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