Put commands into extra job file

Signed-off-by: Ingo Oeser <ingo@jimdo.com>
Define environment via default type parameter

This is a cleanup to reduce differences between this and monitored_job.
Fully implement monitored duplicity job
Put environment variables into job file
factor out copy and paste from tests
specify error handling
Merge pull request #4 from Jimdo/allow_monitored_cron

Allow monitored cron