Make samples more standalone

[iocanel]

It would be nice if samples were standalone.

By standalone I mean:

• have documentation directly in the project directory
• able to run outside the context of the project (e.g. remove parent).
• contain internally all resources they require

The reasoning is pretty simple, one should be able to just copy the sample directory and be able to get started, without having to mess with parents etc.

[csviri]

Note that those samples are not really samples, its more like a starter pack, just used usually for quick smoke/sanity testing. There are samples in a separate project:
https://github.com/java-operator-sdk/samples

We should probably articulate this more somewhere.
But there was a plan to move those samples back to this repo. If I remember correctly @adam-sandor planned to work on that.

[metacosm]

Yes, the samples are really simple ones more meant to be smoke-tests for changes made in the core than real examples.

[csviri]

Will close this issue, after this, it should be covered mostly:
#590