[#LU-16399] Auster's results.yml should record setup/cleanup subtests

Before and after the subtests of a suite run, auster runs a setup/cleanup 'subtest' however it is not recorded in the results.yml file which makes it confusing to users when they fail.

In that session, all of ost-pools sub-tests passed but the suite is marked FAIL. After looking at the ost-pools suite log we can see that the cleanup phase failed.

== ost-pools test complete, duration 3469 sec ============ 06:14:41 (1670998481)
rm: cannot remove '/mnt/lustre/d70b.replay-single/onyx-80vm13.onyx.whamcloud.com': Directory not empty
rm: cannot remove '/mnt/lustre/d70b.replay-single/onyx-80vm12.onyx.whamcloud.com': Directory not empty
 ost-pools : @@@@@@ FAIL: remove sub-test dirs failed 
  Trace dump:
  = /usr/lib64/lustre/tests/test-framework.sh:6526:error()
  = /usr/lib64/lustre/tests/test-framework.sh:6010:check_and_cleanup_lustre()
  = /usr/lib64/lustre/tests/ost-pools.sh:1891:main()
Dumping lctl log to /autotest/autotest-2/2022-12-14/lustre-reviews_review-dne-part-6_91178_8_65e71c9b-ceca-42ee-bf2e-b293cbbbbbb5//ost-pools..*.1670998485.log
CMD: onyx-113vm8,onyx-113vm9,onyx-61vm1,onyx-80vm12.onyx.whamcloud.com,onyx-80vm13 /usr/sbin/lctl dk > /autotest/autotest-2/2022-12-14/lustre-reviews_review-dne-part-6_91178_8_65e71c9b-ceca-42ee-bf2e-b293cbbbbbb5//ost-pools..debug_log.\$(hostname -s).1670998485.log;
		dmesg > /autotest/autotest-2/2022-12-14/lustre-reviews_review-dne-part-6_91178_8_65e71c9b-ceca-42ee-bf2e-b293cbbbbbb5//ost-pools..dmesg.\$(hostname -s).1670998485.log

Here's another example that's more confusing because the suite log shows no indication of a failure.

[LU-16399] Auster's results.yml should record setup/cleanup subtests Created: 14/Dec/22 Updated: 01/Jul/23 Resolved: 20/Jun/23
Status:	Resolved
Project:	Lustre
Component/s:	None
Affects Version/s:	None
Fix Version/s:	Lustre 2.16.0

[LU-16399] Auster's results.yml should record setup/cleanup subtests Created: 14/Dec/22 Updated: 01/Jul/23 Resolved: 20/Jun/23