Install cephfs-csi from CERN metachart

When CERN_METACHART_ENABLED is true cephfs-csi is installed from umbrella chart instead of the magnum existent scripts.

If this option is false and the user has set CEPHFS_CSI_ENABLED the components are installed with the magnum scripts guaranteeing that no backwards compatibility is lost.

Change-Id: I6d3312a43ad0470fae9ca1fd84173b14d0bf2a77

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