CLN: move tools.hashing to util.hashing

[jorisvandenbossche]

xref #13634

[codecov]

Codecov Report

Merging #16086 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #16086   +/-   ##
=======================================
  Coverage   90.84%   90.84%           
=======================================
  Files         159      159           
  Lines       50790    50790           
=======================================
  Hits        46142    46142           
  Misses       4648     4648

Flag	Coverage Δ
#multiple	88.62% <100%> (ø)	⬆️
#single	40.36% <100%> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/util/hashing.py	99.02% <100%> (ø)
pandas/core/indexes/multi.py	96.71% <100%> (ø)	⬆️

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[jreback]

cc @mrocklin

FYI

[jreback]

thanks @jorisvandenbossche