remove (the only) retry logic in mod_authnz_ldap's authentication path

because it's causing the ample retries in mod_ldap to be multiplied by this
outter loop.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1156007 13f79535-47bb-0310-9956-ffa450edef68