dmctl: try read master addr from env (#1722)

[ti-chi-bot]

This is an automated cherry-pick of #1722

What problem does this PR solve?

#1720

What is changed and how it works?

as title

Check List

Tests

• Unit test
• Integration test

Code changes

-None

Side effects

• None

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation
• Need to be included in the release note

[GMHDBJD]

LGTM. Please remember to update docs about this feature. @Ehco1996

[GMHDBJD]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• GMHDBJD

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[GMHDBJD]

/merge

[ti-chi-bot]

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

Commit hash: 392711c