move driver/integrationtest to inner mod

[dxyinme]

No description provided.

[dxyinme]

我觉得可能还需要加点example， 不然变更太大了

先合入 develop，然后弄一个dev的version出来，这样就能把common的replace给省掉了

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 97.05882% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.89%. Comparing base (5558701) to head (7890f53).

Files	Patch %	Lines
dcron.go	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #103      +/-   ##
===========================================
- Coverage    88.14%   87.89%   -0.26%     
===========================================
  Files           17       15       -2     
  Lines         1097     1107      +10     
===========================================
+ Hits           967      973       +6     
- Misses          99      101       +2     
- Partials        31       33       +2     

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