improve on dao

[nanne007]

close #2925

[codecov]

Codecov Report

Merging #2947 (42b38ab) into master (83e4e9d) will decrease coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2947      +/-   ##
==========================================
- Coverage   33.46%   33.30%   -0.16%     
==========================================
  Files         517      517              
  Lines       45123    45123              
  Branches    20565    20566       +1     
==========================================
- Hits        15098    15024      -74     
- Misses      15841    15941     +100     
+ Partials    14184    14158      -26     

Flag	Coverage Δ
unittests	33.30% <ø> (-0.16%)	⬇️

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

Impacted Files	Coverage Δ
...m/types/src/account_config/events/config_change.rs	66.67% <0.00%> (-33.33%)	⬇️
rpc/server/src/module/mod.rs	0.00% <0.00%> (-16.84%)	⬇️
vm/types/src/transaction/error.rs	3.93% <0.00%> (-15.68%)	⬇️
test-helper/src/dummy_network_service.rs	22.23% <0.00%> (-14.81%)	⬇️
executor/src/block_executor.rs	24.45% <0.00%> (-8.88%)	⬇️
vm/natives/src/account.rs	21.43% <0.00%> (-7.14%)	⬇️
cmd/starcoin/src/cli_state.rs	47.37% <0.00%> (-5.26%)	⬇️
commons/forkable-jellyfish-merkle/src/lib.rs	44.66% <0.00%> (-4.19%)	⬇️
cmd/starcoin/src/dev/tests.rs	14.44% <0.00%> (-4.12%)	⬇️
commons/accumulator/src/tree.rs	57.57% <0.00%> (-3.90%)	⬇️
... and 66 more

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