**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.

for (const auto & path_part : replicas)
                {
                    Coordination::Stat stat;
                    String path = fs::path(zookeeper_path) / "replicas" / path_part / "host";
                    zookeeper->get(path, &stat);
                    ops.emplace_back(zkutil::makeCheckRequest(path, stat.version));
                }
                
                replica = findReplicaHavingPart(entry.new_part_name, true);
                
                
                if (replica.empty())
                {
                    Coordination::Stat quorum_stat;
                    const String quorum_unparallel_path = fs::path(zookeeper_path) / "quorum" / "status";
                    const String quorum_parallel_path = fs::path(zookeeper_path) / "quorum" / "parallel" / entry.new_part_name;
                    String quorum_str, quorum_path;
                    ReplicatedMergeTreeQuorumEntry quorum_entry;
                    if (zookeeper->tryGet(quorum_unparallel_path, quorum_str, &quorum_stat))
                        quorum_path = quorum_unparallel_path;
                    else
                    {
                        quorum_str = zookeeper->get(quorum_parallel_path, &quorum_stat);
                        quorum_path = quorum_parallel_path;
                    }
                    quorum_entry.fromString(quorum_str);
                    if (quorum_entry.part_name == entry.new_part_name)
                    {
                        ops.emplace_back(zkutil::makeRemoveRequest(quorum_path, quorum_stat.version));
                        auto part_info = MergeTreePartInfo::fromPartName(entry.new_part_name, format_version);