[WIP] Fix premature server listen for connections

[alesapin]

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• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Fix bug which could lead to server to accept connections before server is actually loaded.

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

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[robot-clickhouse]

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