Fix errors in deploy script

[JohnStrunk]

What type of PR is this?
/kind bug

What this PR does / why we need it:
When using the deploy script, it generated the following error:

./deploy/kubernetes-1.17/deploy-hostpath.sh: line 225: [: csi-driver-host-path: binary operator expected

version_gt was also being passed an incorrect value, and the function itself was not properly stripping the kubernetes- prefix from the passed values.

Previously, the snapshotclass.yaml was never being deployed.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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[k8s-ci-robot]

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[msau42]

/ok-to-test
/assign @ggriffiths

[ggriffiths]

/test pull-kubernetes-csi-csi-driver-host-path-1-16-on-kubernetes-1-16

[ggriffiths]

/lgtm

[msau42]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnStrunk, msau42

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