cronjob_etcd_backup: Use mindepth + maxdepth params

[vinzent]

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What is this PR About?

The cronjob pod exists unsuccessful when it deletes old backups (sometimes). It depends on how find lists the directories to be passed to rm -rv. If it doesn't exist anymore, it will fail.

Removing the "*" globbing and using min-/maxdepth params will find all dirs directly below /mnt/backup. So it will only call rm -rv once per directory.

Another workaround could be to add -f to rm which would ignore non-existent paths to remove.

How do we test this?

Check status and logs of finished CronJob pods.

cc: @redhat-cop/casl