Having `ExecStart=[…]/catalina.sh run` and `Type=simple` result in
tomcat doing everything systemd is expecting without the need to fork or
adding a secondary daemon manager just for this tomcat service.
That means that we don't need ExecStop anymore as the shutdown port is
only there as a OS agnostic shutdown method. The jsvc (aka officially
documented) method of launching tomcat use signals to stop the service
just as systemd will when no ExecStop= is in the unit file so we know it
will work properly.
Moreover add the SyslogIdentifier= directive to make each tomcat easier
to find in the system log.
Victor LABORIE