[Breakage] t0021 Subtest 15 v2.21.0.-rc2 on NonStop.

[Randall S. Becker]

Sadly I have to report that this subtest breaks on NonStop as of v2.21.0-rc2. 
It succeeds when run with --verbose, but not without, making this difficult to 
diagnose.

Sincerely,
Randall