kyua: Add "kyua debug -p" option

This allows the test engine to be paused right before the test cleanup
routine, simplifying debugging.

Reviewed by: ziaee, ngie
Differential Revision: https://revie

kyua: Add "kyua debug -p" option

This allows the test engine to be paused right before the test cleanup
routine, simplifying debugging.

Reviewed by: ziaee, ngie
Differential Revision: https://reviews.freebsd.org/D49463

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