**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.

void Context::checkAccess(const AccessFlags & flags, const std::string_view & database, const std::string_view & table, const Strings & columns) const { return checkAccessImpl(flags, database, table, columns); }
void Context::checkAccess(const AccessFlags & flags, const StorageID & table_id) const { checkAccessImpl(flags, table_id.getDatabaseName(), table_id.getTableName()); }
void Context::checkAccess(const AccessFlags & flags, const StorageID & table_id, const std::string_view & column) const { checkAccessImpl(flags, table_id.getDatabaseName(), table_id.getTableName(), column); }
void Context::checkAccess(const AccessFlags & flags, const StorageID & table_id, const std::vector<std::string_view> & columns) const { checkAccessImpl(flags, table_id.getDatabaseName(), table_id.getTableName(), columns); }
void Context::checkAccess(const AccessFlags & flags, const StorageID & table_id, const Strings & columns) const { checkAccessImpl(flags, table_id.getDatabaseName(), table_id.getTableName(), columns); }
void Context::checkAccess(const AccessRightsElement & element) const { return checkAccessImpl(element); }
void Context::checkAccess(const AccessRightsElements & elements) const { return checkAccessImpl(elements); }
std::shared_ptr<const ContextAccess> Context::getAccess() const
{
    auto lock = getLock();
    return access ? access : ContextAccess::getFullAccess();
}
ASTPtr Context::getRowPolicyCondition(const String & database, const String & table_name, RowPolicy::ConditionType type) const
{
    auto lock = getLock();
    auto initial_condition = initial_row_policy ? initial_row_policy->getCondition(database, table_name, type) : nullptr;
    return getAccess()->getRowPolicyCondition(database, table_name, type, initial_condition);
}
void Context::setInitialRowPolicy()
{
    auto lock = getLock();
    initial_row_policy = nullptr;
    if (client_info.initial_user == client_info.current_user)
        return;
    auto initial_user_id = getAccessControlManager().find<User>(client_info.initial_user);
    if (!initial_user_id)
        return;
    initial_row_policy = getAccessControlManager().getEnabledRowPolicies(*initial_user_id, {});
}
std::shared_ptr<const EnabledQuota> Context::getQuota() const