Changed mysql_component version to v0.2.0

This Cookbook is unified with the Oracle DB-xe component for DB independent Petclinic.

Before accept this PR to master branch and set tag v0.1.0 for current mysql component, then accept PR and set tag v0.2.0. We had to start using versions for components, as old Petclinic manifest won't work with mysql component v0.2.0.