Overhaul handling of LDAP error conditions, so that the util_ldap_*

functions leave the connections in a sane state after errors have
occurred.
PR: 27748, 17274, 17599, 18661, 21787, 24595, 24683, 27134, 27271
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@103706 13f79535-47bb-0310-9956-ffa450edef68