dm-master(dm): use advertise address for ETCD client

[dsdashun]

What problem does this PR solve?

Issue Number: close #4511

What is changed and how it works?

Use the advertise address to places where an ETCD client may be needed. In this PR, when we create an ETCD client, we need to use the advertise address; When we specify the address to join, we actually use the advertise address.

Also the UTs are adapted to the new logic. In the current tests, we set the advertise address and master address the same value so that the server start logic can retrieve the advertise address's value.

What's more, some extra UTs are added to specify the master address as 0.0.0.0:, and set the advertise address to the specific value. Both TLS / non-TLS scenarios are covered.

Check List

Tests

• Unit test

N/A

Side effects

N/A

Related changes

N/A

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lance6716
• lichunzhu

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[dsdashun]

/cc @lichunzhu

[lichunzhu]

LGTM

[lance6716]

/merge

[ti-chi-bot]

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

Commit hash: 46e8913

[dsdashun]

/run-verify

[dsdashun]

/run-dm-integration-test

[ti-chi-bot]

@dsdashun: Your PR was out of date, I have automatically updated it for you.

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[ti-chi-bot]

In response to a cherrypick label: new pull request created: #4639.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #4640.