ITS#9288 Do no change tainted status on failed retry

It seems refcnt == 0 connections are tainted only if they were just
removed from cache.
3 jobs for !223 with its9288 in 44 minutes and 47 seconds (queued for 30 seconds)
latest detached
Status Job ID Name Coverage
  Build
passed #4590
build-gnutls-mit-standalone-lloadd

00:42:56

passed #4588
build-no-threads-no-slapd

00:02:44

passed #4589
build-openssl-heimdal-lloadd

00:44:30