replace .has_key() by in, .has_key() is deprecated

gluon/contrib/login_methods/ldap_auth.py

@@ -664,7 +664,7 @@ def ldap_auth(server='ldap',
         ldap_groups_of_the_user = list()
         for group_row in group_search_result:
             group = group_row[1]
-            if type(group) == dict and group.has_key(group_name_attrib):
+            if type(group) == dict and group_name_attrib in group:
                 ldap_groups_of_the_user.extend(group[group_name_attrib])
 
         con.unbind()