checkdrupalcron: exec comand with sudo to avoid unsecure file permission changes in order to work

Signed-off-by: Christophe Vanlancker <christophe.vanlancker@inuits.eu>
checkdrupalcron: place sudo in the content of the command

Signed-off-by: Christophe Vanlancker <christophe.vanlancker@inuits.eu>