How to specify ai_family explicitly

[NEWPLAN]

we note that gloo supports ipv4 and ipv6 by setting ai_family = AF_UNSPEC and deciding a real one at runtime. However, in our cluster, we got an exception about ai_family mismatching. Our cluster contains both ipv4 and ipv6 network stacks. How can we specify ai_family explicitly?

We run pyroch, and get below exception.
RuntimeError: [enforce fail at ../third_party/gloo/gloo/transport/tcp/device.cc:276] ss1.ss_family == ss2.ss_family. 2 vs 10

[c-p-i-o]

This will require a code change in device.cc. The code should be able to handle both IPV4 & IPV6.

We can take a PR if you have one?