rbd: thick-provision images on request
rbd: thick-provision images on request

Write blocks of stripe-size to allocate RBD images when
Thick-Provisioning is enabled in the StorageClass.

Signed-off-by: Niels de Vos <7bda0c0ee7f47171cc808e9e60292cbc5d8140dd@redhat.com>

ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi