Install cvmfs-csi from CERN metachart
When CERN_METACHART_ENABLED is true cvmfs-csi is installed from umbrella chart instead of the magnum existent scripts.
If this option is false and the user has set CVMFS_CSI_ENABLED the components are installed with the magnum scripts guaranteeing that no backwards compatibility is lost.
Change-Id: Icaf8c24a54064e1ce06eddf42370e0e2735801b9