FIX-#3706: Deflake TestHdf.test_HDFStore. (#3707)
FIX-#3706: Deflake TestHdf.test_HDFStore. (#3707)

The HDF files that Modin and Pandas write sometimes have different bytes.
Instead of checking that they are exactly equal, check that they contain
the same dataframes.

I ran:

```
pytest modin/pandas/test/test_io.py -k test_HDFStore --count 100
```

locally and got 4 failures for 100 attempts. After this commit, I got no
failures.

Signed-off-by: mvashishtha <6a890e1065a1d4e8df9dcf1d9a2c9c740bbcf8aa@ponder.io>
modin-project/modin,modin-project/modin