Handle unsortable Periods correctly in set_index, MultiIndex#18208

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jbrockmendel wants to merge 2 commits intopandas-dev:masterfrom

jbrockmendel:period_bugs3

Commits on Nov 10, 2017

Handle unsortable Periods correctly in set_index, MultiIndex
jbrockmendel
committed
per reviewer suggestion, leave non-(str or int) unsorted
jbrockmendel
committed