run-config.sh: Modified update option to print update link

run-config.sh generates run.sh with update option that compares the client
return to 4 (meaning that the agent needs to be upgraded). If true, update
link is printed to standard output.
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>