Fix Java table partition test to account for non-deterministic ordering

[jlowe]

Contributes to #9375.

TableTest#testPartition was written with the assumption that the ordering within each partition would match the relative ordering within the input table, but this is not guaranteed. Updated the test to sort each partition before comparing against expected results.

[codecov]

Codecov Report

Merging #9385 (9c5816c) into branch-21.12 (ab4bfaa) will decrease coverage by 0.04%.
The diff coverage is 0.00%.

❗ Current head 9c5816c differs from pull request most recent head 721ec10. Consider uploading reports for the commit 721ec10 to get more accurate results

@@               Coverage Diff                @@
##           branch-21.12    #9385      +/-   ##
================================================
- Coverage         10.79%   10.74%   -0.05%     
================================================
  Files               116      116              
  Lines             18869    19080     +211     
================================================
+ Hits               2036     2051      +15     
- Misses            16833    17029     +196     

Impacted Files	Coverage Δ
python/cudf/cudf/__init__.py	0.00% <0.00%> (ø)
python/cudf/cudf/_lib/__init__.py	0.00% <ø> (ø)
python/cudf/cudf/core/_base_index.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/column/categorical.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/column/column.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/column/datetime.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/column/lists.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/column/numerical.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/column/string.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/column/timedelta.py	0.00% <0.00%> (ø)
... and 25 more

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[jlowe]

@gpucibot merge