Fixes #5922: Redirect the output of rudder-agent-check to /dev/null (3.0 style)
Merge pull request #597 from Kegeruneku/bug_5922/dev/5922_redirect_output_of_crontab_to_dev_null_3_0_style

Fixes #5922: Redirect the output of rudder-agent-check to /dev/null (3.0...