Revert temporary SnapshotClass API version change after 1.17 release

[ggriffiths]

We needed to temporarily set the SnapshotClass apiVersion to be v1beta1 for snapshotter beta deployment changes.
https://github.com/kubernetes-csi/csi-driver-host-path/pull/98/files#diff-aa4f2bb53d3cab7051923bade02fac78R1

We should revert this to v1alpha1, and change https://github.com/kubernetes-csi/csi-driver-host-path/pull/98/files#diff-d090135c7b07955c3c2303b588b5dfcfR1054

to be k8s >= 1.17.

[ggriffiths]

/assign ggriffiths
/kind cleanup

[k8s-ci-robot]

@ggriffiths: The label(s) /label cleanup cannot be applied. These labels are supported: api-review, community/discussion, community/maintenance, community/question, cuj/build-train-deploy, cuj/multi-user, platform/aws, platform/azure, platform/gcp, platform/minikube, platform/other

In response to this:

/assign ggriffiths
/label cleanup

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[ggriffiths]

Closing this. Instead, we're going to create a new test instead: k8s 1.17 hostpath deploy on Kubernetes master.