Merge r472633 from trunk:

Better detection and clean up of ldap connection that have been
terminated by the ldap server. PR#40878

Submitted by: Rob Baily <rbaily servicebench com>
Reviewed by: bnicholes


Submitted by: bnicholes
Reviewed by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@484981 13f79535-47bb-0310-9956-ffa450edef68