server: use old interface for scatter region (#4766)

[ti-chi-bot]

This is an automated cherry-pick of #4766

Signed-off-by: nolouch nolouch@gmail.com

What problem does this PR solve?

Issue Number: Close #4763

What is changed and how it works?

server: use old interface for scatter region

Check List

Tests

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• CabinfeverB

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[CabinfeverB]

Rest LGTM

[nolouch]

/merge

[ti-chi-bot]

@nolouch: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

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

Commit hash: c2057da

[codecov]

Codecov Report

Merging #4767 (c2057da) into release-6.0 (fa15ec2) will increase coverage by 0.04%.
The diff coverage is 50.00%.

@@               Coverage Diff               @@
##           release-6.0    #4767      +/-   ##
===============================================
+ Coverage        75.22%   75.26%   +0.04%     
===============================================
  Files              287      287              
  Lines            28163    28163              
===============================================
+ Hits             21185    21198      +13     
+ Misses            5112     5091      -21     
- Partials          1866     1874       +8     

Flag	Coverage Δ
unittests	75.26% <50.00%> (+0.04%)	⬆️

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

Impacted Files	Coverage Δ
server/grpc_service.go	52.46% <50.00%> (+0.74%)	⬆️
pkg/tempurl/tempurl.go	45.00% <0.00%> (-15.00%)	⬇️
pkg/etcdutil/etcdutil.go	84.70% <0.00%> (-3.53%)	⬇️
server/tso/allocator_manager.go	67.02% <0.00%> (-2.32%)	⬇️
server/schedule/operator_controller.go	84.44% <0.00%> (-1.22%)	⬇️
pkg/btree/btree.go	87.37% <0.00%> (-0.76%)	⬇️
server/config/persist_options.go	92.88% <0.00%> (-0.75%)	⬇️
server/server.go	74.92% <0.00%> (-0.48%)	⬇️
server/member/member.go	66.84% <0.00%> (ø)
server/region_syncer/client.go	83.59% <0.00%> (ø)
... and 7 more

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