mod_authnz_ldap: Search or Comparison during authorization phase

can use the credentials from the authentication phase
(AuthLDAPSearchAsUSer,AuthLDAPCompareAsUser).
PR 48340 

Submitted by: Domenico Rotiroti, Eric Covener
Reviewed by: Eric Covener



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@950248 13f79535-47bb-0310-9956-ffa450edef68