iterate all reader hostgroups in set_testing-240 #26

Job	Run time
cache / lock	7s
cache / builds (centos6)	4m 57s
cache / builds (centos7)	4m 42s
cache / builds (debian11)	6m 4s
cache / builds (fedora37, -clang)	6m 33s
cache / builds (ubuntu22, -clang)	7m 9s
cache / builds (ubuntu22, -tap)	10m 7s
cache / unlock	3s
run / select	5s
run / tests (tests)	1h 25m 49s
run / tests (tests_with_deps/deprecate_eof_support)	10m 37s
	2h 16m 13s

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