client.c: Changed client up-to-date message print from stdout to stderr

The up-to-date message (inside update option) is printed to standard error,
instead of standard output, to be redirected to run.log. This patch is
needed because of the run-config.sh change.

Signed-off-by: Erik Alexandre Pucci <eap08@c3sl.ufpr.br>
Acked-by: Diego Giovane Pasqualin <dgp06@c3sl.ufpr.br>
Signed-off-by: Danilo K. S. Yorinori <danilok@c3sl.ufpr.br>