Add fsGroupPolicy to driver

In order to be able to use non-root accounts, it is important for
the driver to allow k8s to change group ids in the cluster. Adding
this value enables this ability so that in all circumstances,
a pod can run with the expected filesystem group ACLs set.

Author: dabradley

deploy/csi-azurelustre-driver.yaml

@@ -4,5 +4,6 @@ kind: CSIDriver
 metadata:
   name: azurelustre.csi.azure.com
 spec:
+  fsGroupPolicy: File
   attachRequired: false
   podInfoOnMount: true