On systems supporting ting ipv4 and ipv6 the second socket to initialize
will not update the listening address correctly after the call to `bind`.
This results in the second address listed in
`Socket::GetListeningConnectionURI` to have port `:0`, which is
incorrect.
To fix this, correct which address is used to detect the port and update
the unit tests to cover this use case.
Additionally, I updated the SocketTest's to only parameterize tests that
can work on ipv4 or ipv6. This means tests like
`SocketTest::DecodeHostAndPort` are only run once, instead of twice
since they do not change behavior based on parameters.
I also included a new unit test to cover listening on `localhost:0`,
validating both sockets correctly list the updated port.
d5ba143a6d