*: add auto sync configuration in creating etcd client (#1240)

[ti-chi-bot]

This is an automated cherry-pick of #1240

What problem does this PR solve?

Issue Number: close #1236

What is changed and how it works?

Add AutoSyncInterval configuration in creating etcd client.

Check List

Tests

• None

Code changes

• None

Side effects

• None

Related changes

• None

Release note

fix the problem that drainer/pump can't work when pd's topology changes

[ti-chi-bot]

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[ti-chi-bot]

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