Stop.sh should make sure that the process has been killed

[jesus-alastria]

alastria-node/scripts/stop.sh

Lines 7 to 11 in 6217d0a

	if [[ "$NODE_TYPE" == "general" ]]; then
	pkill -f constellation-node
	fi
	pkill -f geth

After calling pkill (both for constellation and geth), the script should make sure that the process has been actually stopped, for example calling pgrep and sleeping in a loop several times until pgrep does not return anything, or reporting an error otherwise.