Try to get a clean shutdown of a child for modules. #481

Job	Run time
Empty APLOGNO() test	40s
Default	4m 3s
All-static modules	4m 23s
Prefork MPM, all-modules (except cgid)	4m 29s
Worker MPM, all-modules	4m 45s
Shared MPMs, all-modules	4m 57s
Event MPM, all-modules, mod_cgid only	5m 13s
Event MPM, all-modules, no CMSG_DATA	4m 28s
Default, all-modules + install	5m 31s
Default, all-modules, random test order	5m 33s
GCC 10 maintainer-mode w/-Werror, install + VPATH	3m 51s
All-modules, APR 1.7.4, APR-util 1.6.3	5m 8s
APR 1.8.x, APR-util 1.7.x	7m 46s
Pool-debug	7m 9s
Shared MPMs (event), pool-debug, SSL/TLS variants	12m 28s
Shared MPMs (worker), pool-debug, SSL/TLS variants	12m 35s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	10m 19s
litmus WebDAV tests	3m 11s
Regenerate ap_expr	4m 27s
APR 1.7.4, APR-util 1.6.3, LDAP	6m 30s
APR trunk thread debugging	4m 30s
UBSan	6m 56s
ASan	8m 16s
ASan, pool-debug	7m 48s
HTTP/2 test suite	12m 58s
MOD_TLS test suite	7m 7s
	2h 45m 1s

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