Should report an error if Constellation does not start properly on a given time, or gives errors

[jesus-alastria]

alastria-node/scripts/start.sh

Lines 55 to 59 in 6217d0a

	if [[ "$NODE_TYPE" == "general" ]]; then
	echo "[*] Starting Constellation node"
	nohup constellation-node ~/alastria/data/constellation/constellation.conf 2>> ~/alastria/logs/constellation_"${_TIME}".log &
	check_constellation_isStarted
	fi

The call to check_constellation_isStarted just waits forever until Constellation is started (see #214).
But even if #214 is corrected, this script should report properly any errors to the caller, not just a timeout, by sending back the errors logged by Constellation.
Otherwise it can only be used interactively and not by other programs.