*: show an unsynced message for workers which didn't get any shard DDL (#1638)

[ti-chi-bot]

This is an automated cherry-pick of #1638

What problem does this PR solve?

some users don't use show-ddl-locks to get unsynced tables, they use query-status instead, so we also show reasonable message in query-status

What is changed and how it works?

• re-fill the related field
• also fix a BUG that forget to decrypt password before open connection to upstream which introduced in *: only get master status once when query-status #1619

Check List

Tests

• Integration test

Code changes

• Has (user) interface methods change

Related changes

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

[lance6716]

/lgtm

[ti-chi-bot]

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• lance6716

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[lance6716]

/merge

[ti-chi-bot]

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

Commit hash: b91004c