Empty TCKVerificationSupport.java in the repo

[rsvoboda]

There is an empty TCKVerificationSupport.java file in tck-flow module.

This is probably a leftover from #398 work

There is another TCKVerificationSupport.java file in tck module and it is proper Java file.

[ktoso]

It'd be great if you can send in a PR to remove it! :)

[rsvoboda]

PR #552 is ready

[ktoso]

Thank you!