Add option to change apiVersion for deployments

Thong Kuahrequested to merge
deployment-option-api-version into master

We keep at extensions/v1beta1 for now but intend to change to default to apps/v1 later.

Credit to @loomen for original contribution at #8 (closed)

Related issues:

Manual QA

See #8 (comment 281232991)

Edited by Thong Kuah

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