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