Replace deprecated Socket.gethostbyname with Addrinfo.getaddrinfo

[kojix2]

Replace Socket.gethostbyname with Addrinfo.getaddrinfo in FreeBSD test
Addrinfo.getaddrinfo is available since Ruby 1.9

Rubocop warning:

test/fiddle/test_handle.rb:225:7: W: Lint/DeprecatedClassMethods: Socket.gethostbyname is deprecated in favor of Addrinfo.getaddrinfo.
      Socket.gethostbyname("localhost")
      ^^^^^^^^^^^^^^^^^^^^