TST: suppress some numpy warnings

[jreback]

No description provided.

[codecov]

Codecov Report

Merging #15811 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #15811      +/-   ##
==========================================
- Coverage      91%   90.99%   -0.02%     
==========================================
  Files         143      143              
  Lines       49384    49387       +3     
==========================================
- Hits        44944    44939       -5     
- Misses       4440     4448       +8

Impacted Files	Coverage Δ
pandas/core/algorithms.py	94.43% <100%> (+0.02%)	⬆️
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/core/frame.py	97.56% <0%> (-0.1%)	⬇️
pandas/core/common.py	91.3% <0%> (+0.33%)	⬆️

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