Go TServerSocket doesn't close on Interrupt

When using the Go version of TSimpleServer with a TServerSocket, I expected that calling Stop() would close the socket, but it does not. I discovered this in my test suite when I had to assign new port numbers to each test because otherwise they would fail to rebind.

TSimpleServer.Stop calls TServerSocket.Interrupt, which is where I believe the issue lies. The java version's interrupt method calls close, so this seems to be the expected behavior.