mod_dav: add DavBasePath #466

Job	Run time
Empty APLOGNO() test	31s
Default	3m 54s
All-static modules	4m 25s
Prefork MPM, all-modules (except cgid)	6m 23s
Worker MPM, all-modules	4m 32s
Shared MPMs, all-modules	4m 37s
Event MPM, all-modules, mod_cgid only	4m 47s
Event MPM, all-modules, no CMSG_DATA	5m 19s
Default, all-modules + install	5m 31s
Default, all-modules, random test order	4m 43s
GCC 10 maintainer-mode w/-Werror, install + VPATH	3m 42s
All-modules, APR 1.7.4, APR-util 1.6.3	5m 49s
APR 1.8.x, APR-util 1.7.x	6m 38s
Pool-debug	6m 49s
Shared MPMs (event), pool-debug, SSL/TLS variants	9m 31s
Shared MPMs (worker), pool-debug, SSL/TLS variants	11m 45s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	10m 18s
litmus WebDAV tests	2m 58s
APR 1.7.4, APR-util 1.6.3, LDAP	5m 39s
APR trunk thread debugging	4m 29s
ASan	9m 27s
ASan, pool-debug	9m 40s
HTTP/2 test suite	9m 14s
MOD_TLS test suite	9m 20s
	2h 30m 1s

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