fix: disable app close on parallel

[fengmk2]

#159

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

Description of change

[codecov]

Codecov Report

Base: 53.49% // Head: 85.76% // Increases project coverage by +32.27% 🎉

Coverage data is based on head (5d2b908) compared to base (6f4375c).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #160       +/-   ##
===========================================
+ Coverage   53.49%   85.76%   +32.27%     
===========================================
  Files          24       27        +3     
  Lines        2501     2579       +78     
  Branches      147      468      +321     
===========================================
+ Hits         1338     2212      +874     
+ Misses       1163      367      -796     

Impacted Files	Coverage Δ
register.js	100.00% <100.00%> (ø)
lib/parallel/agent_register.js	100.00% <0.00%> (ø)
lib/prerequire.js	84.00% <0.00%> (ø)
lib/request_call_function.js	62.50% <0.00%> (ø)
lib/app_handler.js	68.96% <0.00%> (+5.17%)	⬆️
app/extend/agent.js	95.34% <0.00%> (+9.30%)	⬆️
index.js	96.80% <0.00%> (+10.63%)	⬆️
lib/format_options.js	97.77% <0.00%> (+12.22%)	⬆️
lib/utils.js	87.80% <0.00%> (+14.63%)	⬆️
lib/inject_context.js	97.65% <0.00%> (+16.40%)	⬆️
... and 10 more

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[killagu]

LGTM