Fix sort_index with multi-index columns.

[ueshin]

Resolves #634.

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Softagram Impact Report for pull/637 (head commit: e482dd8)

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[codecov-io]

Codecov Report

Merging #637 into master will increase coverage by 0.02%.
The diff coverage is 95.23%.

@@            Coverage Diff             @@
##           master     #637      +/-   ##
==========================================
+ Coverage   92.95%   92.97%   +0.02%     
==========================================
  Files          31       31              
  Lines        5093     5085       -8     
==========================================
- Hits         4734     4728       -6     
+ Misses        359      357       -2

Impacted Files	Coverage Δ
databricks/koalas/series.py	92.94% <100%> (+0.21%)	⬆️
databricks/koalas/frame.py	94.65% <95%> (+0.01%)	⬆️

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[garawalid]

Sounds great! Thanks.

[ueshin]

Thanks! merging.