LDAP connection pool did not release/close connections with

"LDAPConnectionPoolTTL 0".  PR58037.

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



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1685650 13f79535-47bb-0310-9956-ffa450edef68