**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.

if (!children.empty())
    {
        LOG_TRACE(log, "Found zookeper locks for {}", zookeeper_part_uniq_node);
        return false;
    }
    zookeeper->tryRemove(zookeeper_part_uniq_node);
    
    children.clear();
    zookeeper->tryGetChildren(zookeeper_part_node, children);
    if (children.empty())
        
        zookeeper->tryRemove(zookeeper_part_node);
    return true;
}
bool StorageReplicatedMergeTree::tryToFetchIfShared(
    const IMergeTreeDataPart & part,
    const DiskPtr & disk,
    const String & path)
{
    const auto settings = getSettings();
    auto disk_type = disk->getType();
    if (!(disk->supportZeroCopyReplication() && settings->allow_remote_fs_zero_copy_replication))
        return false;
    String replica = getSharedDataReplica(part, disk_type);
    
    if (replica.empty())
        return false;
    return executeFetchShared(replica, part.name, disk, path);
}
String StorageReplicatedMergeTree::getSharedDataReplica(