mod_proxy: Consistently close the socket on failure to reuse the conn… #504

Job	Run time
Empty APLOGNO() test	51s
Default	4m 6s
All-static modules	5m 25s
Prefork MPM, all-modules (except cgid)	5m 1s
Worker MPM, all-modules	5m 46s
Shared MPMs, all-modules	6m 16s
Event MPM, all-modules, mod_cgid only	5m 13s
Event MPM, all-modules, no CMSG_DATA	4m 49s
Default, all-modules + install	4m 42s
Default, all-modules, random test order	5m 22s
GCC 10 maintainer-mode w/-Werror, install + VPATH	5m 10s
All-modules, APR 1.7.4, APR-util 1.6.3	5m 39s
APR 1.8.x, APR-util 1.7.x	6m 47s
Pool-debug	6m 54s
Shared MPMs (event), pool-debug, SSL/TLS variants	11m 6s
Shared MPMs (worker), pool-debug, SSL/TLS variants	10m 59s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	10m 57s
litmus WebDAV tests	2m 50s
Regenerate ap_expr	4m 34s
APR 1.7.4, APR-util 1.6.3, LDAP	5m 31s
APR trunk thread debugging	5m 27s
UBSan	5m 51s
ASan	8m 4s
ASan, pool-debug	8m 10s
HTTP/2 test suite	15m 32s
MOD_TLS test suite	6m 55s
	2h 47m 57s

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