tools/hotplug: remove 4 from default runlevel in init scripts

tools/hotplug: remove 4 from default runlevel in init scripts

Remove 4 from default runlevel in xen-watchdog, xend and xendomains.

Similar to what changeset 24847:0900b1c905f1 does in xencommons, remove
runlevel 4 from the other runlevel scripts. LSB defines runlevel 4 as
reserved for local use, the local sysadmin is responsible for symlink
creation in rc4.d.

Runlevel 4 was specified in Default-Start since a very long time. Then
it was copied also to the new xen-watchdog in 21861:fb3649141e19. Until
now this was not an issue since only xencommons is automatically enabled
during package install, and a custom xend and xendomains script is
included in the SuSE packages. Since some time a rpmlint check complains
about the wrong Default-Start entry in xen-watchdog.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Committed-by: Ian Jackson <ian.jackson.citrix.com>