Convert port number to string automatically

[ligurio]

memcached doesn't accept port number as a Lua number, it forces user to convert it to string explicitly.

tarantool> mc.create('instance_2', 8020, {})
2022-02-17 11:17:58.763 [3263879] main/101/interactive I> Initializing SASL: begin
2022-02-17 11:17:58.765 [3263879] main/101/interactive I> Initializing SASL: done
2022-02-17 11:17:58.766 [3263879] main/112/__mc_instance_2_expire I> Memcached expire fiber started
---
- error: 'builtin/uri.lua:46: bad argument #2 to ''uri_parse'' (cannot convert ''number''
    to ''const char *'')'
...

tarantool> 

I think memcached can do it automatically.

[Totktonada]

What is interesing:

Tarantool 2.10.0-beta2-134-gdadb8d70b
type 'help' for interactive help
tarantool> uri = require('uri')
---
...

tarantool> uri.parse(3301)
---
- service: '3301'
...

Tarantool 1.10.12-39-gf83be3f9d
type 'help' for interactive help
tarantool> uri = require('uri')
---
...

tarantool> uri.parse(3301)
---
- error: 'builtin/uri.lua:46: bad argument #2 to ''uri_parse'' (cannot convert ''number''
    to ''const char *'')'
...

I guess recent patches around multiple listening sockets for iproto affected this behaviour.