Fix reload bug

[fishbar]

• 修复重载config失败问题
• 修复old进程关闭异常

[codecov]

Codecov Report

Merging #81 into master will decrease coverage by 0.12%.
The diff coverage is 60%.

@@            Coverage Diff             @@
##           master      #81      +/-   ##
==========================================
- Coverage   92.35%   92.22%   -0.13%     
==========================================
  Files          12       12              
  Lines        1621     1621              
==========================================
- Hits         1497     1495       -2     
- Misses        124      126       +2

Impacted Files	Coverage Δ
lib/master.js	91.29% <100%> (ø)	⬆️
lib/child.js	90.65% <50%> (-0.57%)	⬇️

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