ARROW-6683: [Python] Test for fastparquet <-> pyarrow cross-compatibility

[jorisvandenbossche]

https://issues.apache.org/jira/browse/ARROW-6683

@wesm is this more or less what you were thinking?

[kszucs]

@ursabot build

[kszucs]

The fast parquet test should run in the Buildbot conda builders now.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@7f2d637). Click here to learn what that means.
The diff coverage is 18.75%.

@@            Coverage Diff            @@
##             master    #5498   +/-   ##
=========================================
  Coverage          ?   66.34%           
=========================================
  Files             ?      508           
  Lines             ?    70145           
  Branches          ?        0           
=========================================
  Hits              ?    46537           
  Misses            ?    23608           
  Partials          ?        0

Impacted Files	Coverage Δ
python/pyarrow/tests/test_parquet.py	95.44% <18.75%> (ø)

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[jorisvandenbossche]

The fast parquet test should run in the Buildbot conda builders now.

Indeed:

...
pyarrow/tests/test_parquet.py::test_fastparquet_cross_compatibility PASSED [ 80%]
...

[kszucs]

LGTM