Consolidate common code that got duplicated by 2.3.x authz refactoring. Arrange for backend LDAP connections to be returned to the pool by a fixup hook rather than staying locked until the end of (a potentially slow) request. Add a little more trace4 to the authnz_ldap side of LDAP connection obtain/release.
httpd/httpd/trunk/CHANGES
httpd/httpd/trunk/modules/aaa/mod_authnz_ldap.c