AuTest CI: inconsistent remap_reload test results

[bneradt]

I've noticed that the new remap_reload test is a bit inconsistent. Out of the last 24 autest CI runs, it has failed 4 times:

• https://ci.trafficserver.apache.org/view/Github/job/Github_Builds/job/autest/996/console
• https://ci.trafficserver.apache.org/view/Github/job/Github_Builds/job/autest/997/console
• https://ci.trafficserver.apache.org/view/Github/job/Github_Builds/job/autest/1002/console
• https://ci.trafficserver.apache.org/view/Github/job/Github_Builds/job/autest/1007/console