Move network fuzzers from //testing/libfuzzer/fuzzers to //net

net/ftp/ftp_ctrl_response_fuzzer.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "net/ftp/ftp_ctrl_response_buffer.h"
 #include "net/log/net_log.h"
 
 // Entry point for LibFuzzer.
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   const net::BoundNetLog log;
   net::FtpCtrlResponseBuffer buffer(log);
   if (!buffer.ConsumeData(reinterpret_cast<const char*>(data), size)) {
     return 0;
   }
   while (buffer.ResponseAvailable()) {
     (void)buffer.PopResponse();
   }
   return 0;
 }