Fixes project and role checking when a user's naming attribute is not uid.

nova/auth/ldapdriver.py

@@ -585,10 +585,11 @@ class LdapDriver(object):
         else:
             return None
 
-    @staticmethod
-    def __dn_to_uid(dn):
+    def __dn_to_uid(self, dn):
         """Convert user dn to uid"""
-        return dn.split(',')[0].split('=')[1]
+        query = '(objectclass=novaUser)'
+        user = self.__find_object(dn, query)
+        return user[FLAGS.ldap_user_id_attribute][0]
 
 
 class FakeLdapDriver(LdapDriver):