Merge changes Ie13868e5,Ie2c1e0ca,Ib91037bf,Ibf204b14,I0b1079c4, ...

* changes:
  Replace a DCHECK with a parse failure in connection ID parsing
  Move drop_response_body from QuicClient to QuicSpdyClientBase to share with chromium
  Extract the FakeProofVerifier from quic_client_bin.cc to facilitate sharing with Chromium.
  Add QuicFramer Probe methods
  Remove .impl() method from QuicSocketAddress and QuicIpAddress.
  Change QuartcClientEndpoint to handle client-side version negotiation.
  In quic_client_bin.cc, print the "Request (succeeded|failed)" messages in stdout instead of stderr.
  Have separate uni- and bi-directional stream limits for IETF QUIC
  Fix a use-after-free in quic_client.