[config] fixdevnet config load muilti time

[YouNeedWork]

Pull request type

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: #3621

[YouNeedWork]

@jolestar request review

[codecov]

Codecov Report

Merging #3622 (e5b46b5) into master (06d5321) will increase coverage by 0.27%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #3622      +/-   ##
==========================================
+ Coverage   28.95%   29.22%   +0.27%     
==========================================
  Files         589      589              
  Lines       49864    49873       +9     
  Branches    23450    23457       +7     
==========================================
+ Hits        14434    14570     +136     
+ Misses      21274    21235      -39     
+ Partials    14156    14068      -88     

Flag	Coverage Δ
unittests	29.22% <0.00%> (+0.27%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
node/src/lib.rs	16.79% <0.00%> (-0.63%)	⬇️
vm/natives/src/lib.rs	80.00% <0.00%> (-10.00%)	⬇️
config/src/helper.rs	37.26% <0.00%> (-3.92%)	⬇️
txpool/src/pool/listener/tests.rs	10.91% <0.00%> (-3.63%)	⬇️
chain/api/src/errors.rs	25.00% <0.00%> (-3.57%)	⬇️
config/src/lib.rs	30.28% <0.00%> (-2.38%)	⬇️
chain/src/verifier/mod.rs	30.99% <0.00%> (-2.11%)	⬇️
vm/transaction-builder/src/lib.rs	26.41% <0.00%> (-1.46%)	⬇️
...mmons/accumulator/src/inmemory/accumulator_test.rs	42.05% <0.00%> (-1.13%)	⬇️
sync/src/sync.rs	27.02% <0.00%> (-1.11%)	⬇️
... and 54 more

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