'Returns True if initiator exists.'

def check_iscsi_initiator_exists(self, iqn):

    initiator_exists = True
    try:
        auth_list = netapp_api.NaElement('iscsi-initiator-get-auth')
        auth_list.add_new_child('initiator', iqn)
        self.connection.invoke_successfully(auth_list, True)
    except netapp_api.NaApiError:
        initiator_exists = False
    return initiator_exists
