[#noissue] Cleanup Server.shutdown

[emeroad]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.

Project coverage is 36.93%. Comparing base (eebe59d) to head (96db345).

Files	Patch %	Lines
.../com/navercorp/pinpoint/grpc/util/ServerUtils.java	0.00%	11 Missing ⚠️
...pinpoint/collector/receiver/grpc/GrpcReceiver.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #11258   +/-   ##
=========================================
  Coverage     36.93%   36.93%           
+ Complexity    12055    12053    -2     
=========================================
  Files          3995     3996    +1     
  Lines         98050    98053    +3     
  Branches      10415    10416    +1     
=========================================
+ Hits          36210    36214    +4     
+ Misses        58874    58871    -3     
- Partials       2966     2968    +2     

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