util: rename qemu_*block() socket functions

The qemu_*block() functions are meant to be be used with sockets (the
win32 implementation expects SOCKET)

Over time, those functions where used with Win32 SOCKET or
file-descriptors interchangeably. But for portability, they must only be
used with socket-like file-descriptors. FDs can use
g_unix_set_fd_nonblocking() instead.

Rename the functions with "socket" in the name to prevent bad usages.

This is effectively reverting commit f9e8cacc55 ("oslib-posix:
rename socket_set_nonblock() to qemu_set_nonblock()").

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

hw/hyperv/syndbg.c

@@ -334,7 +334,7 @@ static void hv_syndbg_realize(DeviceState *dev, Error **errp)
         return;
     }
 
-    qemu_set_nonblock(syndbg->socket);
+    qemu_socket_set_nonblock(syndbg->socket);
 
     syndbg->servaddr.sin_port = htons(syndbg->host_port);
     syndbg->servaddr.sin_family = AF_INET;