Update CSI snaphotter and make it independent (#7943)

* CSI: update CSI snapshot CRDs

* CSI: update snapshot controller tag version with kubernetes specific versions

* CSI: allow enabling csi_snapshot_controller independent of Cinder CSI

* CSI: Align csi-snapshot-controller with upstream and use a Deployment instead of a StatefulSet

roles/kubernetes-apps/snapshots/snapshot-controller/templates/snapshot-controller.yml.j2

@@ -6,7 +6,7 @@
 # Vanilla Kubernetes, kube-system makes sense for the namespace.
 
 ---
-kind: StatefulSet
+kind: Deployment
 apiVersion: apps/v1
 metadata:
   name: snapshot-controller
@@ -17,6 +17,15 @@ spec:
   selector:
     matchLabels:
       app: snapshot-controller
+  # the snapshot controller won't be marked as ready if the v1 CRDs are unavailable
+  # in #504 the snapshot-controller will exit after around 7.5 seconds if it
+  # can't find the v1 CRDs so this value should be greater than that
+  minReadySeconds: 15
+  strategy:
+    rollingUpdate:
+      maxSurge: 0
+      maxUnavailable: 1
+    type: RollingUpdate
   template:
     metadata:
       labels: