Connect: Don't use the TUR checks on re-connects

Only use TUR to eat any pending unit attentions on the initial connect
but not during reconnect.

From Peter Lieven <pl@kamp.de>

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>

lib/connect.c

@@ -130,7 +130,7 @@ iscsi_login_cb(struct iscsi_context *iscsi, int status, void *command_data _U_,
 		return;
 	}
 
-	if (ct->lun != -1) {
+	if (ct->lun != -1 && !iscsi->old_iscsi) {
 		if (iscsi_testunitready_task(iscsi, ct->lun,
 						  iscsi_testunitready_cb, ct) == NULL) {
 			iscsi_set_error(iscsi, "iscsi_testunitready_async failed.");