ARROW-2692: [Python] Add test for writing dictionary encoded columns to chunked Parquet files

[xhochy]

No description provided.

[codecov-io]

Codecov Report

Merging #2127 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2127      +/-   ##
==========================================
+ Coverage   86.37%   86.38%   +<.01%     
==========================================
  Files         230      230              
  Lines       40589    40592       +3     
==========================================
+ Hits        35059    35064       +5     
+ Misses       5530     5528       -2

Impacted Files	Coverage Δ
python/pyarrow/tests/test_parquet.py	95.54% <100%> (+0.01%)	⬆️
cpp/src/arrow/compute/kernels/cast.cc	89.87% <0%> (+0.51%)	⬆️

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[wesm]

+1