net: Basic netns dump/restore skeleton

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

net.c

@@ -0,0 +1,18 @@
+#include <unistd.h>
+#include "syscall-types.h"
+#include "namespaces.h"
+#include "net.h"
+
+int dump_net_ns(int pid, struct cr_fdset *fds)
+{
+	int ret;
+
+	ret = switch_ns(pid, CLONE_NEWNET, "net", NULL);
+
+	return ret;
+}
+
+int prepare_net_ns(int pid)
+{
+	return -1;
+}