Added call to integrity-checker.sh before run the agent

If the update process fails on some transfer, the agent can't be called.
We are adding the call to integrity-checker.sh to ensure that the system is
properly installed before running agent again.

Acked-by: Ricardo Tavares de Oliveira <rto07@c3sl.ufpr.br>
Acked-by: Danilo K. S. Yorinori <danilok@c3sl.ufpr.br>
Signed-off-by: Vinicius Ruoso <vkr07@c3sl.ufpr.br>