server: decouple start of etcd client from server

[lhy1024]

Signed-off-by: lhy1024 admin@liudos.us

What problem does this PR solve?

Issue Number: Ref #5837

What is changed and how does it work?

For some mcs, they don't need to start all services, but they need to enable etcd client and client.

Check List

Tests

• Unit test
• Integration test

Release note

None.

[ti-chi-bot]

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• rleungx

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[rleungx]

/merge

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: c27c3e8

[codecov]

Codecov Report

Base: 74.97% // Head: 75.04% // Increases project coverage by +0.07% 🎉

Coverage data is based on head (71fa3bd) compared to base (5be9cf3).
Patch coverage: 66.66% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5857      +/-   ##
==========================================
+ Coverage   74.97%   75.04%   +0.07%     
==========================================
  Files         335      335              
  Lines       34085    34094       +9     
==========================================
+ Hits        25554    25586      +32     
+ Misses       6340     6321      -19     
+ Partials     2191     2187       -4     

Flag	Coverage Δ
unittests	75.04% <66.66%> (+0.07%)	⬆️

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

Impacted Files	Coverage Δ
server/server.go	74.36% <66.66%> (-0.74%)	⬇️
pkg/id/id.go	86.44% <0.00%> (-6.78%)	⬇️
server/region_syncer/server.go	81.86% <0.00%> (-5.50%)	⬇️
pkg/election/leadership.go	77.31% <0.00%> (-3.10%)	⬇️
pkg/storage/endpoint/meta.go	63.63% <0.00%> (-2.28%)	⬇️
pkg/member/member.go	65.78% <0.00%> (-1.58%)	⬇️
pkg/btree/btree_generic.go	86.34% <0.00%> (-0.93%)	⬇️
server/schedule/operator_controller.go	85.97% <0.00%> (-0.91%)	⬇️
server/schedulers/evict_leader.go	78.57% <0.00%> (-0.90%)	⬇️
server/schedule/checker/rule_checker.go	80.95% <0.00%> (-0.74%)	⬇️
... and 17 more

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[binshi-bing]

reviewed