Merge r1881790, r1904513, r1909400, r1909401, r1909402, r1909451, r1912459, r1913432,r1913534 from trunk #561

Job	Run time
Empty APLOGNO() test	40s
Default	30m 15s
All-static modules	30m 14s
Prefork MPM, all-modules (except cgid)	21m 34s
Worker MPM, all-modules	30m 13s
Shared MPMs, all-modules	30m 54s
Event MPM, all-modules, mod_cgid only	30m 11s
Event MPM, all-modules, no CMSG_DATA	30m 14s
Default, all-modules + install	30m 14s
Default, all-modules, random test order	30m 13s
GCC 10 maintainer-mode w/-Werror, install + VPATH	2m 43s
All-modules, APR 1.7.4, APR-util 1.6.3	22m 35s
APR 1.8.x, APR-util 1.7.x	16m 37s
Pool-debug	23m 58s
Shared MPMs (event), pool-debug, SSL/TLS variants	21m 7s
Shared MPMs (worker), pool-debug, SSL/TLS variants	18m 51s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	17m 51s
litmus WebDAV tests	2m 49s
APR 1.7.4, APR-util 1.6.3, LDAP	8m 20s
APR trunk thread debugging	15m 48s
ASan	9m 50s
ASan, pool-debug	10m 57s
HTTP/2 test suite	20m 35s
MOD_TLS test suite	27m 35s
	8h 4m 18s

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