Use a factory to create ClientHandshake (#59)

Summary:
This will allow to be able to create different kind of handshake going forward.
Pull Request resolved: facebook/mvfst#59

Reviewed By: siyengar

Differential Revision: D18088574

Pulled By: mjoras

fbshipit-source-id: 0732bb63a9e243fef77cdaf4f76e711fcb09ecdc

Author: deadalnix

proxygen/httpserver/samples/hq/HQClient.cpp

@@ -159,7 +159,7 @@ void HQClient::initializeQuicClient() {
 
   client->setPacingTimer(pacingTimer_);
   client->setHostname(params_.host);
-  client->setFizzClientContext(createFizzClientContext(params_));
+  client->setFizzClientQuicHandshakeContext(createFizzClientContext(params_));
   // This is only for testing, this should not be use in prod
   client->setCertificateVerifier(
       std::make_unique<

proxygen/lib/http/HQConnector.cpp

@@ -59,7 +59,7 @@ void HQConnector::connect(
   auto sock = std::make_unique<folly::AsyncUDPSocket>(eventBase);
   auto quicClient =
       quic::QuicClientTransport::newClient(eventBase, std::move(sock));
-  quicClient->setFizzClientContext(fizzContext);
+  quicClient->setFizzClientQuicHandshakeContext(fizzContext);
   quicClient->setCertificateVerifier(std::move(verifier));
   quicClient->setHostname(sni.value_or(connectAddr.getAddressStr()));
   quicClient->addNewPeerAddress(connectAddr);