fix(newClient): exit if client name already taken

fix  #613

openvpn-install.sh

@@ -1059,7 +1059,8 @@ function newClient() {
 	CLIENTEXISTS=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep -c -E "/CN=$CLIENT\$")
 	if [[ $CLIENTEXISTS == '1' ]]; then
 		echo ""
-		echo "The specified client CN was found in easy-rsa."
+		echo "The specified client CN was already found in easy-rsa, please choose another name."
+		exit
 	else
 		cd /etc/openvpn/easy-rsa/ || return
 		case $PASS in