Changing return method from vdsmd start function

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1019360
Change-Id: I24985450addd3feb26687d42be741d9f357dc8c5
Signed-off-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/19884
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/20578