set systemd settings similar to lighttpd2

except that HUP does not reload lighttpd 1.4.x config
Those who only use systemd lighttpd service 'reload' to rotate
access log files might choose to add a command to send lighttpd a
HUP signal.  See github pull request (below) for further discussion.

[patch edited by gstrauss]

x-ref:
  https://github.com/lighttpd/lighttpd1.4/pull/72

doc/systemd/lighttpd.service

@@ -3,8 +3,10 @@ Description=Lighttpd Daemon
 After=network.target
 
 [Service]
-ExecStartPre=/usr/sbin/lighttpd -t -f /etc/lighttpd/lighttpd.conf
+Type=simple
+ExecStartPre=/usr/sbin/lighttpd -tt -f /etc/lighttpd/lighttpd.conf
 ExecStart=/usr/sbin/lighttpd -D -f /etc/lighttpd/lighttpd.conf
+Restart=on-failure
 
 [Install]
 WantedBy=multi-user.target