Timeouts: Fix bugs in scsi task timeout code

Add a test to verify the pdu timeout handling.
Fix numerous bugs in the timeout handling. It was really broken.

Add test for non-SCSI task PDUs too and verify they works.

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

lib/socket.c

@@ -889,6 +889,8 @@ iscsi_service(struct iscsi_context *iscsi, int revents)
 			return iscsi_service_reconnect_if_loggedin(iscsi);
 		}
 	}
+	iscsi_timeout_scan(iscsi);
+
 	return 0;
 }