vdsmd.init.in: removing /var/log/vdsm/libvirt.log

We added it quite long ago to track libvirt lost event issues.
These days we are much stable and libvirtd.log already contains
libvirt informations.

Change-Id: I2b777c42b29a747bfdc647af56a0e7d56c16194f
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=928217
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/13728
Reviewed-by: Dan Kenigsberg <danken@redhat.com>