**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 String & table_zookeeper_path, const ReplicatedMergeTreeLogEntryData & entry, Int64 wait_for_inactive_timeout)
{
    LOG_DEBUG(log, "Waiting for all replicas to process {}", entry.znode_name);
    auto zookeeper = getZooKeeper();
    Strings replicas = zookeeper->getChildren(fs::path(table_zookeeper_path) / "replicas");
    Strings unwaited;
    bool wait_for_inactive = wait_for_inactive_timeout != 0;
    for (const String & replica : replicas)
    {
        if (wait_for_inactive || zookeeper->exists(fs::path(table_zookeeper_path) / "replicas" / replica / "is_active"))
        {
            if (!tryWaitForReplicaToProcessLogEntry(table_zookeeper_path, replica, entry, wait_for_inactive_timeout))
                unwaited.push_back(replica);
        }
        else
        {
            unwaited.push_back(replica);
        }
    }
    LOG_DEBUG(log, "Finished waiting for all replicas to process {}", entry.znode_name);
    return unwaited;
}
void StorageReplicatedMergeTree::waitForAllReplicasToProcessLogEntry(