**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 (!inactive_replicas.empty() && inactive_replicas.count(replica))
            break;
        
        
        if (!getZooKeeper()->exists(fs::path(zookeeper_path) / "mutations" / mutation_id))
        {
            throw Exception(ErrorCodes::UNFINISHED, "Mutation {} was killed, manually removed or table was dropped", mutation_id);
        }
        if (partial_shutdown_called)
            throw Exception("Mutation is not finished because table shutdown was called. It will be done after table restart.",
                ErrorCodes::UNFINISHED);
        
        if (!inactive_replicas.empty() && inactive_replicas.count(replica))
            continue;
        
        std::set<String> mutation_ids;
        mutation_ids.insert(mutation_id);
        
        
        auto mutation_status = queue.getIncompleteMutationsStatus(mutation_id, &mutation_ids);
        checkMutationStatus(mutation_status, mutation_ids);
    }
    if (!inactive_replicas.empty())
    {
        throw Exception(ErrorCodes::UNFINISHED,
                        "Mutation is not finished because some replicas are inactive right now: {}. Mutation will be done asynchronously",
                        boost::algorithm::join(inactive_replicas, ", "));
    }
}
void StorageReplicatedMergeTree::createNewZooKeeperNodes()