[CDS] Use global storage templates for PVC
OOM has now templates in order to create the needed PVC, using:
* a PV with a specific class when using a common nfs mount path between
nodes (sames as today use) --> is the default behavior today
* or a storage class if we want to use dynamic PV.
On this case, we use (in order of priority):
- persistence.storageClassOverride if set on the chart
- global.persistence.storageClass if set globally
- persistence.storageClass if set on the chart
Change-Id: I9ffc9f121fb68993dd7bf96d4909913c3aaa09c3
Issue-ID: OOM-1227
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>