qga: Add shutdown/halt/reboot support for FreeBSD

Add appropriate shutdown command arguments to qmp_guest_shutdown()
for FreeBSD.

Reviewed-by: Konstantin Kostiuk <kkostiuk@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
Signed-off-by: Konstantin Kostiuk <kkostiuk@redhat.com>

qga/commands-posix.c

@@ -90,6 +90,10 @@ void qmp_guest_shutdown(bool has_mode, const char *mode, Error **errp)
     const char *powerdown_flag = "-i5";
     const char *halt_flag = "-i0";
     const char *reboot_flag = "-i6";
+#elif defined(CONFIG_BSD)
+    const char *powerdown_flag = "-p";
+    const char *halt_flag = "-h";
+    const char *reboot_flag = "-r";
 #else
     const char *powerdown_flag = "-P";
     const char *halt_flag = "-H";
@@ -120,6 +124,9 @@ void qmp_guest_shutdown(bool has_mode, const char *mode, Error **errp)
 #ifdef CONFIG_SOLARIS
         execl("/sbin/shutdown", "shutdown", shutdown_flag, "-g0", "-y",
               "hypervisor initiated shutdown", (char *)NULL);
+#elif defined(CONFIG_BSD)
+        execl("/sbin/shutdown", "shutdown", shutdown_flag, "+0",
+               "hypervisor initiated shutdown", (char *)NULL);
 #else
         execl("/sbin/shutdown", "shutdown", "-h", shutdown_flag, "+0",
                "hypervisor initiated shutdown", (char *)NULL);