Fix reindex for multi-index columns support.

[ueshin]

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Softagram Impact Report for pull/659 (head commit: 4b66455)

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[codecov-io]

Codecov Report

Merging #659 into master will increase coverage by 0.02%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##           master     #659      +/-   ##
==========================================
+ Coverage   93.43%   93.45%   +0.02%     
==========================================
  Files          32       32              
  Lines        5314     5333      +19     
==========================================
+ Hits         4965     4984      +19     
  Misses        349      349

Impacted Files	Coverage Δ
databricks/koalas/frame.py	94.71% <94.44%> (+0.07%)	⬆️

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[ueshin]

Thanks! merging.