This function deletes backup job by id.
Doesn't return any data.
jetapi backup -F deleteBackupJob -D '_id=5b59d203d5ac5e651d0af502'
https://hostname.example.com:2087/cpsess##########/cgi/addons/jetbackup/api.cgi?function=deleteBackupJob&_id=5b59d203d5ac5e651d0af502