do more clean shutdown

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 54.38%. Comparing base (1be1807) to head (f13ea82).

Files with missing lines	Patch %	Lines
g3proxy/src/inspect/smtp/mod.rs	0.00%	5 Missing ⚠️
g3proxy/src/inspect/imap/mod.rs	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #506      +/-   ##
==========================================
- Coverage   54.39%   54.38%   -0.01%     
==========================================
  Files        1180     1180              
  Lines      108542   108555      +13     
==========================================
+ Hits        59037    59041       +4     
- Misses      49505    49514       +9     

Flag	Coverage Δ
g3bench	31.67% <ø> (ø)
g3proxy	53.92% <50.00%> (-0.01%)	⬇️
lib	25.11% <ø> (ø)

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