TST: Remove tests for hdf files created with pandas <= v0.11
- [ x] closes #17375
- [ ] tests added / passed
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x ] whatsnew entry

Tests for old compatability removed because this issue is sufficiently old now, that people should be expected to have solved this by now.

@jreback , the methods ``test_legacy_table_read`` and ``test_legacy_table_write`` don't say if they concern pandas <=0.11 or it's newer compatability issues. It it ok to remove those?

See also discussion in #17375.
I'm having some strange issue with changes in the the doc directory not being registered by git, so I'm having problems by v0.21.txt + some other issues.

I'm going do everything over again in a new pull request. @topper-123 even if you clean-up your branch locally, you can still push to the same branch on your fork to update this PR I made the changes to ``v0.21.txt`` in the Github online editor, but that got me those red crosses. 

I really don't know what's causing this and i'm not interested in investigating. I would rather just start over (unless you got a quick tip I could try out) This has been replaced by #17404. Closing.