Call qemu_socketpair() instead of socketpair() when possible

Call qemu_socketpair() instead of socketpair() when possible

As qemu_socketpair() was introduced in commit 3c63b4e9
("oslib-posix: Introduce qemu_socketpair()"), it's time
to replace the other existing socketpair() calls with
qemu_socketpair() if possible

Signed-off-by: Guoyi Tu <tugy@chinatelecom.cn>
Acked-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <cd28916a-f1f3-b54e-6ade-8a3647c3a9a5@chinatelecom.cn>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>