[v9_11] Various system test fixes
Backport of various system test fixes from !3623 (merged) (comment 150463), except for "Remove cross-test dependency on ckdnsrps.sh", which does not apply.
Backport of various system test fixes from !3623 (merged) (comment 150463), except for "Remove cross-test dependency on ckdnsrps.sh", which does not apply.