Revert "lib,src: add unix socket getsockname/getpeername"

Revert "lib,src: add unix socket getsockname/getpeername"

This reverts commit 6cd0e2664b1ce944e5e461457d160be83f70d379.
This reverts commit 7a999a13766ac68049812fedbdfd15a0250f0f07.
This reverts commit f337595441641ad36f6ab8ae770e56c1673ef692.

It turns out that on Windows, uv_pipe_getsockname() is a no-op for
client sockets.  It slipped through testing because of a CI snafu.

PR-URL: https://github.com/nodejs/node/pull/2584
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>