The meaning of the "Required-Stop" tag is which services must be
available during shutdown of a service. Avoid specifying the same
runlevel for the "Default-Start" and "Default-Stop" tag. Also,
the default start runlevels on Debian are 2, 3, 4 and 5.
See also http://refspecs.linuxfoundation.org/LSB_3.2.0/LSB-Core-generic/LSB-Core-generic/initscrcomconv.html.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>