修复调用shell执行mongodb命令时出现WARNING的问题 (hhyo#1237)

[weideguo]

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[request-info]

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[codecov]

Codecov Report

Merging #1348 (2e3dee8) into master (ff7a07a) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1348      +/-   ##
==========================================
- Coverage   75.61%   75.58%   -0.04%     
==========================================
  Files          81       81              
  Lines       12514    12520       +6     
==========================================
  Hits         9463     9463              
- Misses       3051     3057       +6     

Impacted Files	Coverage Δ
sql/engines/mongo.py	47.92% <0.00%> (-0.45%)	⬇️

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