Added check on inep file when generating the run minute to cron

If the inep file is missing, we calculate the cron run minute based on a
random number. This will allow the agent.sh to run correctly even when
there's no inep stored on the system.

Signed-off-by: Vinicius Ruoso <vkr07@c3sl.ufpr.br>
Acked-by: Diego Pasqualin <dgp06@c3sl.ufpr.br>
Acked-by: Erik Alexandre Pucci <eap08@c3sl.ufpr.br>
Acked-by: Ricardo T Oliveira <rto07@c3sl.ufpr.br>
Signed-off-by: Josiney de Souza <josineys@c3sl.ufpr.br>