Bugfix/issue 381 update the ip trie dictionary key type

[lizhou1111]

this close #381
The clickhouse has 7 extended dictionary types:

• flat
• hased
• range_hased
• cache
• complex_key_hased
• complex_key_cache
• ip_trie

The key type of previous ip_trie type dictionary is fixed string, So the third argument passed to dict_get('dict_name', attr_names, id_expr) should be fixed_string.After this update the argument type has been changed to ipv4(only ipv4 can work,clickhouse does the same).
For example:

drop stream if exists geoip_t;
CREATE stream if not exists geoip_t (
  cidr string,
  latitude float64,
  longitude float64,
  country_code string,
  state string,
  city string
) ENGINE = MergeTree ORDER BY cidr;
insert into geoip_t values ('188.166.84.125',52.3759,4.8975,'NL','North Holland','Amsterdam')

select * from geoip_t;

drop dictionary geoip;
-- ingest data from table, you can ingest data from csv(etc. source (FILE(path './test.csv' format 'CSVWithNames'))).
CREATE DICTIONARY geoip (
  cidr string,
  latitude float64,
  longitude float64,
  country_code string,
  state string,
  city string
) PRIMARY KEY cidr
SOURCE (ClickHouse (table 'geoip_t'))
LIFETIME (MIN 300 MAX 360)
LAYOUT (IP_TRIE());


select dict_get('geoip', 'latitude', to_ipv4('188.166.84.125')) as result;
┌──result─┐
│ 52.3759 │
└─────────┘