If MySQL Driver does not exist by default, or not installed when MySQL is installed, then the provisioned cluster has the following errors.
In this case, create a Recipe in Cloudbreak to install MySQL jdbc driver at pre-ambari-start time:
During Create Cluster, use Advance option. Pick the recipe pk-install-mysql-driver-pre from the drop down and click Attach. This will ensure that the jdbc driver is installed before Ambari is started.
This should then result in a clean install.