derive controller name from prototype and allow custom name

[guillaume86]

What this PR does / why we need it:
This PR add a new InitWithName function that allow passing in a custom controller name, and changes the default name to be inferred from the prototype when possible.

Special notes for your reviewer:
It's my first contribution and first time with Go so reviews are welcome.

Additional documentation:
Change should simple enough to be self explanatory.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: guillaume86 / name: Guillaume Lecomte (76c90bc, 6f7eb57)

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[tomasaschan]

Thanks for your contribution!

As the GetCommonName doesn't have any other usages within this project, it'd be great if you could add some rudimentary unit tests for this functionality too :) In the meantime, I'll tag this as OK to test so that any tests you push can run here.

/ok-to-test

[tomasaschan]

/lgtm
/approve

Very nice, thank you for contributing!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: guillaume86, tomasaschan

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