fix: patch in correct context cancellation

[jakobmoellerdev]

As requested per https://github.com/kubernetes-sigs/sig-storage-lib-external-provisioner/issues/155 . Awaits the context and provides a graceful shutdown instead of waiting indefinitely.

Also some minor import cleanup and documentation auto format.

duplicate of https://github.com/kubernetes-sigs/sig-storage-lib-external-provisioner/pull/156

Co-authored-by: @MatthiasWerning

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[andyzhangx]

/ok-to-test

[jsafrane]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, jakobmoellerdev, jsafrane

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