Etcd test2

[lhy1024]

What problem does this PR solve?

Issue Number: Close #xxx

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[codecov-commenter]

Codecov Report

Merging #9 (3750da7) into master (cae6783) will decrease coverage by 44.89%.
Report is 171 commits behind head on master.
The diff coverage is 25.21%.

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@@             Coverage Diff             @@
##           master       #9       +/-   ##
===========================================
- Coverage   74.49%   29.61%   -44.89%     
===========================================
  Files         417      395       -22     
  Lines       42894    41885     -1009     
===========================================
- Hits        31954    12403    -19551     
- Misses       8100    28175    +20075     
+ Partials     2840     1307     -1533     

Flag	Coverage Δ
unittests	29.61% <25.21%> (-44.89%)	⬇️

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