Add volumesnapshots and csi-hostpath-driver to regional-dr

With these addons we can deploy busybox using `csi-hostpath-sc` storage
class and ramen will setup replication using volsync and submariner.

Signed-off-by: Nir Soffer <nsoffer@redhat.com>

test/envs/regional-dr.yaml

@@ -18,6 +18,9 @@ templates:
     memory: "6g"
     extra_disks: 1
     disk_size: "50g"
+    addons:
+      - volumesnapshots
+      - csi-hostpath-driver
     workers:
       - addons:
           - name: cert-manager