Sort getaddrinfo result based on address family

Sort getaddrinfo result based on address family

Putting getaddrinfo result in a set to eliminate duplicates causes race
 conditions because sets are unordered

For example consider 2 applications try to bind to many random ports at once
 in both IPV4 and IPV6.
App1: Bind to random IPV4 address and get port 50000
App2: Bind to random IPV6 address and get port 50000
App2: Try to bind to same port on IPV4 and fails as App1 already bound to it
The same goes for App1

To resolve this, we create the set explicitly outside the loop.
We order the returned list of getaddrinfo based on Address family.
We skip the iteration if the iteration tuple already in the set.
Otherwise we execute the loop.