Merge r1685650 from trunk:

LDAP connection pool did not release/close connections with 
"LDAPConnectionPoolTTL 0".  PR58037.

Submitted by: Ted Phelps <phelps gnusto.com>
committed by: covener


Submitted by: covener
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1686275 13f79535-47bb-0310-9956-ffa450edef68