net: native_stack: change native_stack server_socket_impl to api_v2
net: native_stack: change native_stack server_socket_impl to api_v2

Avoid variadic futures in the implementation.

syuu1228/seastar,dreamsxin/seastar,avikivity/seastar,cloudius-systems/seastar,avikivity/seastar,scylladb/seastar,scylladb/seastar,avikivity/seastar,cloudius-systems/seastar,syuu1228/seastar,scylladb/seastar,dreamsxin/seastar,cloudius-systems/seastar,dreamsxin/seastar,syuu1228/seastar