**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 zookeeper = getZooKeeper();
    
    zookeeper->createIfNotExists(zookeeper_path + "/quorum", String());
    zookeeper->createIfNotExists(zookeeper_path + "/quorum/parallel", String());
    zookeeper->createIfNotExists(zookeeper_path + "/quorum/last_part", String());
    zookeeper->createIfNotExists(zookeeper_path + "/quorum/failed_parts", String());
    
    zookeeper->createIfNotExists(replica_path + "/min_unprocessed_insert_time", String());
    zookeeper->createIfNotExists(replica_path + "/max_processed_insert_time", String());
    
    zookeeper->createIfNotExists(zookeeper_path + "/mutations", String());
    zookeeper->createIfNotExists(replica_path + "/mutation_pointer", String());
    
    const auto settings = getSettings();
    if (settings->allow_remote_fs_zero_copy_replication)
    {
        zookeeper->createIfNotExists(zookeeper_path + "/zero_copy_s3", String());
        zookeeper->createIfNotExists(zookeeper_path + "/zero_copy_s3/shared", String());
        zookeeper->createIfNotExists(zookeeper_path + "/zero_copy_hdfs", String());
        zookeeper->createIfNotExists(zookeeper_path + "/zero_copy_hdfs/shared", String());
    }
    
    zookeeper->createIfNotExists(zookeeper_path + "/part_moves_shard", String());
    zookeeper->createIfNotExists(zookeeper_path + "/pinned_part_uuids", getPinnedPartUUIDs()->toString());
    
    zookeeper->createIfNotExists(zookeeper_path + "/alter_partition_version", String());
}
bool StorageReplicatedMergeTree::createTableIfNotExists(const StorageMetadataPtr & metadata_snapshot)