**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.

{
    auto lock = getLock();
    if (!shared->compression_codec_selector)
    {
        constexpr auto config_name = "compression";
        const auto & config = getConfigRef();
        if (config.has(config_name))
            shared->compression_codec_selector = std::make_unique<CompressionCodecSelector>(config, "compression");
        else
            shared->compression_codec_selector = std::make_unique<CompressionCodecSelector>();
    }
    return shared->compression_codec_selector->choose(part_size, part_size_ratio);
}
DiskPtr Context::getDisk(const String & name) const
{
    std::lock_guard lock(shared->storage_policies_mutex);
    auto disk_selector = getDiskSelector(lock);
    return disk_selector->get(name);
}
StoragePolicyPtr Context::getStoragePolicy(const String & name) const
{
    std::lock_guard lock(shared->storage_policies_mutex);
    auto policy_selector = getStoragePolicySelector(lock);
    return policy_selector->get(name);
}
DisksMap Context::getDisksMap() const