Merge r1348036 from trunk:

* include/util_ldap.h: Treat LDAP_UNAVAILABLE as a transient error
  with non-MS LDAP SDKs; seen with OpenLDAP against Novell eDirectory.

Submitted by: Filip Valder <filip.valder vsb.cz> (via RH bugzilla)
Reviewed by: jorton, sf, rjung


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1362056 13f79535-47bb-0310-9956-ffa450edef68