LU-15179 tests: add trap cleanup_quota_test

LU-15179 tests: add trap cleanup_quota_test

Add stack_trap cleanup_quota_test to the tests that
use setup_quota_test. If a test fails without calling
cleanup_quota_test, it may cause later tests to fail
due to used space > 0.

Remove ${tdir}_dom, if exists, in cleanup_quota_test.
sanity-quota_75 doesn't remove test_dom directory.

Lustre-change: https://review.whamcloud.com/#/c/45418/
Lustre-commit: c44b2bea1bacc3cb9173353037cf3a616f13669f

Test-Parameters: trivial  testlist=sanity-quota
Fixes: a4fbe734("LU-14739 quota: nodemap squashed root cannot bypass quota")
Change-Id: Ife4fd499b427bee79f74a5e172d233fe6a83e240
Signed-off-by: Sergey Cheremencev <sergey.cheremencev@hpe.com>
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/48705
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>