parasite: remove unused headers

Signed-off-by: Stanislav Kinsbursky <skinsbursky@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

parasite.c

 #include <sys/mman.h>
-#include <sys/socket.h>
-#include <unistd.h>
 
-#include "compiler.h"
-#include "types.h"
 #include "syscall.h"
 #include "parasite.h"
 #include "util.h"
-#include "util-net.h"
 
 /*
  * Some notes on parasite code overall. There are a few