net: Clean up includes

Clean up includes so that osdep.h is included first and headers
which it implies are not included manually.

This commit was created with scripts/clean-includes.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1454089805-5470-11-git-send-email-peter.maydell@linaro.org
diff --git a/net/l2tpv3.c b/net/l2tpv3.c
index 21d6119..824161c 100644
--- a/net/l2tpv3.c
+++ b/net/l2tpv3.c
@@ -23,9 +23,9 @@
  * THE SOFTWARE.
  */
 
+#include "qemu/osdep.h"
 #include <linux/ip.h>
 #include <netdb.h>
-#include "config-host.h"
 #include "net/net.h"
 #include "clients.h"
 #include "qemu-common.h"