Move net.h to include/net/

+ Move net-android.c and net.c to net/
+ Rename net-checksum.c to net/checksum.c
+ Move sockets.h and shaper.h to include/android/
  and sockets.c + shaper.c to android/

+ Move vgafont.h to ui/

Change-Id: I2659a919a316d3f95aac0f9924833eeee4cb5592
diff --git a/android/main.c b/android/main.c
index 1ca94df..757a05f 100644
--- a/android/main.c
+++ b/android/main.c
@@ -18,7 +18,7 @@
 #include <process.h>
 #endif
 
-#include "sockets.h"
+#include "android/sockets.h"
 
 #include "android/android.h"
 #include "qemu-common.h"