DiagStatusCommandTest failures on build servers, passing locally

The DiagStatusCommandTest introduced in https://git.opendaylight.org/gerrit/#/c/76341/ which passed for the past 8 days since being merge suddenly started failing since the last Patch Set 8 of https://git.opendaylight.org/gerrit/#/c/76532.

The weird thing is that https://git.opendaylight.org/gerrit/#/c/76532/7..8 didn't change anything that could reasonably have anything to do with this. So this sporadic - it failed again on c/76532 (x2) after a "recheck", but on https://git.opendaylight.org/gerrit/#/c/76827 (which is based on c/76532) it failed once and on recheck passed!! Locally it always passes, of course.