Move role related views to FAB Auth manager:

- List roles
- Edit role
- Create role
- View role
else:
                
                bind_username = username
                
                
                if self.auth_ldap_append_domain:
                    bind_username = bind_username + "@" + self.auth_ldap_append_domain
                
                
                
                if self.auth_ldap_username_format:
                    bind_username = self.auth_ldap_username_format % bind_username
                
                
                if not self._ldap_bind(ldap, con, bind_username, password):
                    if user:
                        self.update_user_auth_stat(user, False)
                    
                    log.info(LOGMSG_WAR_SEC_LOGIN_FAILED.format(bind_username))
                    return None