message: Refactor fizz::Factory
  Summary: fizz::Factory refactoring.
diff: #pragma once
  -#include <fizz/protocol/Factory.h>
  +#include <fizz/protocol/OpenSSLFactory.h>
  #include <quic/codec/PacketNumberCipher.h>
  namespace quic {
  constexpr folly::StringPiece kQuicHkdfLabelPrefix = "quic ";
  -class QuicFizzFactory : public fizz::Factory {
  +class QuicFizzFactory : public fizz::OpenSSLFactory {
  public:
  std::unique_ptr<fizz::PlaintextReadRecordLayer> makePlaintextReadRecordLayer()
  const override;
  