**Describe the issue**
ClickHouse is unable to start up after upgrading from 20.8 to 21.8. 

There is a replicated table with `:` in zk path and it couldn't be loaded with:

`2021.09.15 03:49:58.435071 [ 633075 ] {} <Error> Application: DB::Exception: Unknown auxiliary ZooKeeper name '/test_prefix'. If it's required it can be added to the section <auxiliary_zookeepers> in config.xml: Cannot attach table `db1`.`table1` from metadata file /var/lib/clickhouse/metadata/db1/table1.sql from query ATTACH TABLE db1.table1 (`field1` String, `date` Date) ENGINE = ReplicatedMergeTree('/test_prefix:db1/{shard}/table1', '{replica}') PARTITION BY toMonth(date) PRIMARY KEY field1 ORDER BY field1 SETTINGS index_granularity = 8192: while loading database `db1` from path /var/lib/clickhouse/metadata/db1
`

**Expected behavior**
ClickHouse server is able to startup after upgrade without schema change. "test_prefix" in "/test_prefix:db1/{shard}/table1" is not interpreted as an auxiliary ZooKeeper name.

const auto storage_settings_ptr = getSettings();
    bool insane = unexpected_parts_rows > total_rows_on_filesystem * storage_settings_ptr->replicated_max_ratio_of_wrong_parts;
    constexpr const char * sanity_report_fmt = "The local set of parts of table {} doesn't look like the set of parts in ZooKeeper: "
                                               "{} rows of {} total rows in filesystem are suspicious. "
                                               "There are {} unexpected parts with {} rows ({} of them is not just-written with {} rows), "
                                               "{} missing parts (with {} blocks).";
    if (insane && !skip_sanity_checks)
    {
        throw Exception(ErrorCodes::TOO_MANY_UNEXPECTED_DATA_PARTS, sanity_report_fmt, getStorageID().getNameForLogs(),
                        formatReadableQuantity(unexpected_parts_rows), formatReadableQuantity(total_rows_on_filesystem),
                        unexpected_parts.size(), unexpected_parts_rows, unexpected_parts_nonnew, unexpected_parts_nonnew_rows,
                        parts_to_fetch.size(), parts_to_fetch_blocks);
    }
    if (unexpected_parts_nonnew_rows > 0)
    {
        LOG_WARNING(log, sanity_report_fmt, getStorageID().getNameForLogs(),
                    formatReadableQuantity(unexpected_parts_rows), formatReadableQuantity(total_rows_on_filesystem),
                    unexpected_parts.size(), unexpected_parts_rows, unexpected_parts_nonnew, unexpected_parts_nonnew_rows,
                    parts_to_fetch.size(), parts_to_fetch_blocks);
    }
    
    queue.setBrokenPartsToEnqueueFetchesOnLoading(std::move(parts_to_fetch));
    
    for (const DataPartPtr & part : unexpected_parts)
    {
        LOG_ERROR(log, "Renaming unexpected part {} to ignored_{}", part->name, part->name);
        forgetPartAndMoveToDetached(part, "ignored", true);
    }
}
void StorageReplicatedMergeTree::syncPinnedPartUUIDs()