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
Obtained from:
Submitted by:
Reviewed by:	minfrin, jim, trawick, bnicholes


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@103728 13f79535-47bb-0310-9956-ffa450edef68