CLN: fix some issues in asv benchmark suite
Was trying to run benchmarks, and bumped into some issue (+ the DataMatrix, I just removed that as this is now removed from pandas, so not much sense having benchmarks for that)

@pv added another commit for tables/pytables as well
 ## [Current coverage](https://codecov.io/gh/pydata/pandas/pull/13630?src=pr) is **84.33%**

> Merging [#13630](https://codecov.io/gh/pydata/pandas/pull/13630?src=pr) into [master](https://codecov.io/gh/pydata/pandas/branch/master?src=pr) will decrease coverage by **<.01%**

``` diff
@@             master     #13630   diff @@
==========================================
  Files           138        138          
  Lines         51096      51095     -1   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
- Hits          43094      43093     -1   
  Misses         8002       8002          
  Partials          0          0          
```

> Powered by [Codecov](https://codecov.io?src=pr). Last updated by [dbd5330...6b6f07f](https://codecov.io/gh/pydata/pandas/compare/dbd53306e4a1c091cf41426d1297648b042c771c...6b6f07fdba4e0abe66c84fc2ea49124d20eb65c1?src=pr)
