ldap attributes filter in user_groups()

ldap search currently fetches ALL attributes which is a waste of bandwidth resources and
woefully slow on large ldap groups when it only needs to parse the name_attr

Signed-off-by: Jijo Varghese <jijojv@gmail.com>

awx/sso/ldap_group_types.py

@@ -42,6 +42,7 @@ class PosixUIDGroupType(LDAPGroupType):
                 )
 
             search = group_search.search_with_additional_term_string(filterstr)
+            search.attrlist = [self.name_attr]
             groups = search.execute(ldap_user.connection)
         except (KeyError, IndexError):
             pass
@@ -72,4 +73,3 @@ class PosixUIDGroupType(LDAPGroupType):
             is_member = False
 
         return is_member
-