Move to operator-sdk v.0.17.0

[akram]

Changes

Move to operator-sdk v.0.17.0

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Release Notes

Move to operator-sdk v.0.17.0

[akram]

This is required for this: #357

[akram]

pkg/test: only register --kubeconfig if not registered, get value if already registered
Motivation for the change: controller-runtime currently adds the --kubeconfig flag if pkg/client/config is imported (set up in an init() function). The SDK's test framework also adds this flag, which will panic if both packages are imported and the test framework is initialized.