Support for passing Path to Socket bind & connect methods

[yoshuawuyts]

In alexcrichton/mio-uds all socket types are constructed from references to Path. This is to match the API of std's unix socket types.

It'd be great if socket2 would expose extra methods to bind and connect on Path types when the unix feature is enabled. This would save some unsafe code and boilerplate for consumers implementing unix socket types.

Thanks heaps!

[sfackler]

You can construct a SockAddr from a Path: https://docs.rs/socket2/0.3.11/socket2/struct.SockAddr.html#method.unix

[yoshuawuyts]

Oh! Yeah that's pretty much all I need!