Remove more bogus systemd service dependencies

Adding syslog.target is obsolete, avahi.target does not
exist and dbus.target is also obsolete
Reported-by: NLennart Poettering <lpoetter@redhat.com>
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

daemon/libvirtd.service.in

@@ -5,9 +5,6 @@
 
 [Unit]
 Description=Virtualization daemon
-After=syslog.target
-After=avahi.target
-After=dbus.target
 Before=libvirt-guests.service
 
 [Service]