Mysql operator clone

[Ales Verbic]

Sidecar often ends that it found metadata_schema_version and then exits (return 0). Then the consequence is that the MySQL container is trying to connect with user mysqladmin, which doesn’t exist as MySQL was not initialized properly and can't connect because step L391 has never run. I assume that note: we may have to wait might be waiting for some additional implementation. And I might, for that reason, experience non-determined behavior.

This happens randomly and more often if I want to initialize a cluster and clone mysql-db that has a higher amount of data.

https://github.com/mysql/mysql-operator/blob/trunk/mysqloperator/sidecar_main.py#L374