torture: Make kvm-remote.sh print size of downloaded tarball

This commit causes kvm-remote.sh to print the size of the tarball that
is downloaded to each of the remote systems. This size can help with
performance projections and analysis.

Signed-off-by: Paul E. McKenney <[e-mail]>

tools/testing/selftests/rcutorture/bin/kvm-remote.sh

···
 done
 
 # Download and expand the tarball on all systems.
+echo Build-products tarball: `du -h $T/binres.tgz` | tee -a "$oldrun/remote-log"
 for i in $systems
 do
 	echo Downloading tarball to $i `date` | tee -a "$oldrun/remote-log"