Cloud SQL Gen 2 instances come with a default 'root'@'%' user on
creation. This change automatically deletes that user after creation. A
Terraform user must use the google_sql_user to create a user with
appropriate host and password.
* provider/google Document MySQL versions for second generation instances
Google Cloud SQL has first-gen and second-gen instances with different
supported versions of MySQL.
* provider/google Increase SQL Admin operation timeout to 10 minutes
Creating SQL instances for MySQL 5.7 can take over 7 minutes,
so the timeout needs to be increased to allow the
google_sql_database_instance resource to successfully create.