LP#1281750 Ignore deleted users in usrgroup info APIs

Ignore deleted users in these API calls:

open-ils.actor.usergroup.members.balance_owed
open-ils.actor.usergroup.members.retrieve
open-ils.actor.usergroup.leaders.retrieve
open-ils.actor.address.members

Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Remington Steed <rjs7@calvin.edu>
Signed-off-by: Dan Wells <dbw2@calvin.edu>