dom0-updates: use qvm-run, not qrexec-client directly

dom0-updates/qubes-dom0-update

@@ -75,12 +75,12 @@ fi
 # becuase otherwise yum might complain about future timestamps
 qvm-sync-clock
 
-echo "Checking for dom0 updates" >&2
+echo "Using $UPDATEVM as updatevm to download updates for Dom0, this may take some of time..." >&2
 
 # Start VM if not running already
 qvm-run $QVMRUN_OPTS -a $UPDATEVM true || exit 1
 
-/usr/lib/qubes/qrexec-client -d "$UPDATEVM" -l 'tar c /var/lib/rpm /etc/yum.repos.d /etc/yum.conf 2>/dev/null' 'user:tar x -C /var/lib/qubes/dom0-updates' 2> /dev/null
+tar c /var/lib/rpm /etc/yum.repos.d /etc/yum.conf 2>/dev/null | qvm-run -p "$UPDATEVM" tar x -C /var/lib/qubes/dom0-updates 2> /dev/null
 
 qvm-run $QVMRUN_OPTS --pass-io $UPDATEVM "/usr/lib/qubes/qubes-download-dom0-updates.sh --doit --nogui $ALL_OPTS"
 RETCODE=$?