**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.

{
    std::lock_guard lock(shared->zookeeper_mutex);
    const auto & config = shared->zookeeper_config ? *shared->zookeeper_config : getConfigRef();
    if (!shared->zookeeper)
        shared->zookeeper = std::make_shared<zkutil::ZooKeeper>(config, "zookeeper", getZooKeeperLog());
    else if (shared->zookeeper->expired())
        shared->zookeeper = shared->zookeeper->startNewSession();
    return shared->zookeeper;
}
namespace
{
bool checkZooKeeperConfigIsLocal(const Poco::Util::AbstractConfiguration & config, const std::string & config_name)
{
    Poco::Util::AbstractConfiguration::Keys keys;
    config.keys(config_name, keys);
    for (const auto & key : keys)
    {
        if (startsWith(key, "node"))
        {
            String host = config.getString(config_name + "." + key + ".host");
            if (isLocalAddress(DNSResolver::instance().resolveHost(host)))
                return true;
        }
    }
    return false;
}
}
bool Context::tryCheckClientConnectionToMyKeeperCluster() const