Use ensure_packages() to install the cron packages

[baldurmen]

By default, mysql::backup::mysqldump and mysql::backup::mysqlbackup classes try to install cron-related packages.

This is pretty annoying, since it makes Puppet fail if any other package tries to do the same thing.

This PR adds a parameter (default: false) to be able to manage this.

[baldurmen]

Travis CI seems broken, but I'm pretty this PR didn't break it :)

Happy to rebase on something that works if needed.

[sheenaajay]

@baldurmen Thanks for submitting the PR. Much appreciated. Can we set the value to true by default so the current behaviour won't change and user can use the following variable($install_cron) to install cron package or not . Hence we won't be introducing backward incompatibility. Thank you.

[baldurmen]

I was recently showed the ensure_package() function by a colleague and it seems like a much cleaner solution to this problem. I'll have a go a changing this patch when I have some time.

[sheenaajay]

@baldurmen Thanks for submitting the PR. Please let us know if you need any help in getting this PR.Thank you.

[baldurmen]

Sorry this took so long ... life^WCovid-19 happened.

[sheenaajay]

Thank you @baldurmen for submitting the PR. Good Job.