improve command gen dao by removing all dao files if clear option is true

[gqcn]

No description provided.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e8051ba) 79.97% compared to head (017d1f8) 79.97%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2502   +/-   ##
=======================================
  Coverage   79.97%   79.97%           
=======================================
  Files         599      599           
  Lines       49795    49795           
=======================================
+ Hits        39822    39826    +4     
+ Misses       8013     8010    -3     
+ Partials     1960     1959    -1     

Flag	Coverage Δ
go-1.15-386	80.02% <ø> (+0.01%)	⬆️
go-1.15-amd64	79.99% <ø> (-0.02%)	⬇️
go-1.16-386	80.03% <ø> (+0.04%)	⬆️
go-1.16-amd64	80.03% <ø> (+0.03%)	⬆️
go-1.17-386	80.01% <ø> (+0.01%)	⬆️
go-1.17-amd64	?
go-1.18-386	?
go-1.18-amd64	79.92% <ø> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
os/gfpool/gfpool_file.go	65.71% <0.00%> (-2.86%)	⬇️
os/gfsnotify/gfsnotify_watcher_loop.go	83.19% <0.00%> (-2.53%)	⬇️
contrib/registry/zookeeper/zookeeper_watcher.go	51.11% <0.00%> (+2.22%)	⬆️
net/gtcp/gtcp_pool.go	75.55% <0.00%> (+6.66%)	⬆️

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