dm: fix peer-urls of dm-master

[nexustar]

What problem does this PR solve?

• fix DM cluster can't start while -hostname use FQDN #1911

What is changed and how it works?

Check List

Tests

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

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

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

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• srstack

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[codecov-commenter]

Codecov Report

Merging #1926 (c067a76) into master (568324c) will increase coverage by 28.42%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1926       +/-   ##
===========================================
+ Coverage   23.95%   52.37%   +28.42%     
===========================================
  Files         281      307       +26     
  Lines       32522    35462     +2940     
===========================================
+ Hits         7788    18572    +10784     
+ Misses      23864    14695     -9169     
- Partials      870     2195     +1325     

Flag	Coverage Δ
cluster	40.92% <ø> (?)
dm	24.40% <ø> (?)
playground	12.94% <ø> (?)
tiup	14.45% <ø> (ø)
unittest	21.03% <ø> (ø)

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

Impacted Files	Coverage Δ
pkg/cluster/operation/destroy.go	59.45% <0.00%> (ø)
components/dm/task/update_dm_meta.go	87.76% <0.00%> (ø)
components/playground/instance/process.go	92.31% <0.00%> (ø)
pkg/cluster/operation/check.go	47.42% <0.00%> (ø)
pkg/cluster/operation/scale_in.go	55.13% <0.00%> (ø)
...onents/playground/instance/tiflash_proxy_config.go	80.00% <0.00%> (ø)
pkg/cluster/operation/telemetry.go	0.00% <0.00%> (ø)
pkg/cluster/operation/pd_member.go	0.00% <0.00%> (ø)
pkg/logger/debug.go	16.67% <0.00%> (ø)
pkg/cluster/operation/upgrade.go	55.88% <0.00%> (ø)
... and 214 more

---

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[srstack]

/merge

[ti-chi-bot]

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

Commit hash: 967ebdb

[ti-chi-bot]

@nexustar: Your PR was out of date, I have automatically updated it for you.

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[nexustar]

/merge