Deploy cluster in parallel

[crystaldust]

Current deploying cluster in parallel with singular will fail, the reason is that the SSH commands direct both stdio and stderr to the same stream, which is not handled by a locker, so somethings the stream content would be empty(stdio flushes the correct result, no error occurs, then stderr flushes the empty content).

To solve this, just pass 2 readers to SSH commands, receive stdio and stderr separately.