[FLINK-24273][kubernetes] Relocate io.fabric8 dependency.

[dmvk]

https://issues.apache.org/jira/browse/FLINK-24273

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[tillrohrmann]

Thanks for adding shading for io.fabric8 @dmvk. I think the change itself looks good. However, we have a problem because shading of resource files can fail if no clean is executed. See elastic/apm-agent-java#961. That's why the test_ci misc profile fails.

I do see potential solutions:

1. Run clean for flink-kubernetes when running mvn verify.
2. Add io.fabric8.* dependencies to flink-shaded and use these dependencies directly.

Option 2) is probably more work but probably also the cleaner solution.

cc @zentol.

[tillrohrmann]

I've tried bumping the maven-shade-plugin version to 3.2.4 but it suffered from the same problem.

[tillrohrmann]

@dmvk it would also be good to understand where a dependency conflict arises with the unrelocated io.fabric8.* dependencies.

[rmetzger]

It seems that the issue in the maven shade plugin has been fixed: apache/maven-shade-plugin#150 / https://issues.apache.org/jira/browse/MSHADE-425 in 3.4.0. We are still on 3.2.4.
I will try and see if we can easily bump the version.

[rmetzger]

Closing as a duplicate.