run-config.sh: Added support to return the client binary return code

This is necessary because the collect agent must find out if it needs to
auto-update.

When calling run.sh with "--update" option, the collect agent must check if
the return code equals to 4 to update.

Signed-off-by: Vinicius Ruoso <vkr07@c3sl.ufpr.br>
Acked-by: Ricardo Tavares de Oliveira <rto07@c3sl.ufpr.br>
Acked-by: Diego Giovane Pasqualin <dgp06@c3sl.ufpr.br>
Acked-by: Josiney de Souza <josineys@c3sl.ufpr.br>
Signed-off-by: Danilo K. S. Yorinori <danilok@c3sl.ufpr.br>