**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.

zkutil::ZooKeeper & zookeeper, String & partition_id, LogEntry & entry, ContextPtr query_context, bool detach)
{
    String alter_partition_version_path = zookeeper_path + "/alter_partition_version";
    Coordination::Stat alter_partition_version_stat;
    zookeeper.get(alter_partition_version_path, &alter_partition_version_stat);
    MergeTreePartInfo drop_range_info;
    
    std::optional<EphemeralLockInZooKeeper> delimiting_block_lock;
    if (!getFakePartCoveringAllPartsInPartition(partition_id, drop_range_info, delimiting_block_lock))
    {
        LOG_INFO(log, "Will not drop partition {}, it is empty.", partition_id);
        return false;
    }
    clearBlocksInPartition(zookeeper, partition_id, drop_range_info.min_block, drop_range_info.max_block);
    String drop_range_fake_part_name = getPartNamePossiblyFake(format_version, drop_range_info);
    LOG_DEBUG(log, "Disabled merges covered by range {}", drop_range_fake_part_name);
    
    entry.type = LogEntry::DROP_RANGE;
    entry.source_replica = replica_name;