[cern] OS-8105 - [ADD] StorageClasses for testing(default) and production

This commit will allow the automatic creation of two storage classes when a k8s cluster is cretated. This classes are: testing: Which is the manila share on geneva, and it is also the one used by default if the user does not specify a class to use production: The manila share on meyrin to be used for production purposes.

Change-Id: Ib4306d5b586b78ebb39893384d937b855b658d0f