Fix cannot create SEQUENTIAL node with keeper-client

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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 cannot create SEQUENTIAL node with keeper-client

/ :) create /clickhouse/tmp- 'bar' PERSISTENT SEQUENTIAL
Syntax error: failed at position 41 (' '):

create /clickhouse/tmp- 'bar' PERSISTENT SEQUENTIAL

Expected end of query

Documentation entry for user-facing changes

[ ] Documentation is written (mandatory for new features)

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