RFR: 8272600: (test) Use native "sleep" in Basic.java [v2]

[Ioi Lam]

On Wed, 25 Aug 2021 21:45:57 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> The intermittent test in java/lang/ProcessBuilder/Basic.java has identified unexpected messages from a child Java VM
>> as the cause of the test failure.  Attempts to control the output of the child VM have failed, the VM is unrepentant .
>> 
>> There is no functionality in the child except to wait long enough for the test to finish and the child is destroyed.
>> The fix is to switch from using a Java child to using a native child; a new executable `sleepmillis`.
>
> Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Revised to use a native program for sleep

LGTM

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Marked as reviewed by iklam (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/5239