Improve test_raft_repl_dev UT

[xiaoxichen]

majar changes:

1. fix device list
2. when leader switches , new leader will continue to write in write_on_leader.
3. logging improvement, print out ms/us for timestamp.

Other than UT

implement rollback for statemachine.

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Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 68.16%. Comparing base (1a0cef8) to head (aa77d71). Report is 55 commits behind head on master.

Files with missing lines	Patch %	Lines
...rc/lib/replication/repl_dev/raft_state_machine.cpp	0.00%	7 Missing :warning:

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Additional details and impacted files

@@             Coverage Diff             @@
##           master     #464       +/-   ##
===========================================
+ Coverage   56.51%   68.16%   +11.64%     
===========================================
  Files         108      109        +1     
  Lines       10300    10438      +138     
  Branches     1402     1400        -2     
===========================================
+ Hits         5821     7115     +1294     
+ Misses       3894     2645     -1249     
- Partials      585      678       +93     

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[JacksonYao287]

I believe this PR will be very helpful for raft_repl_dev UT. pls proceed and finish this PR, thanks

[zhiteng]

This PR has been idle for one month. Do we still want to merge this?

[JacksonYao287]

This PR has been idle for one month. Do we still want to merge this?

this PR is very helpful to make repl_dev unit test stable in github CI. after this , we can enable Leader_Restart which stucks intermittently.

@xiaoxichen pls go ahead and complete this PR when you get cycle.