vdsmd.init.in: simplify system services management by using vdsm-tool

In vdsm-tool there is a module implemented the service management
utilities that covers systemd, upstart and sysv.

Change-Id: I57a89d969b8ff4eba57daa893dc29840358c30e7
Signed-off-by: Zhou Zheng Sheng <zhshzhou@linux.vnet.ibm.com>
Reviewed-on: http://gerrit.ovirt.org/13702
Reviewed-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>