Log Message:
Changes 1.4.0:
* Renew test key pair
* Fix OpenSSL 1.1.0 deprecation warnings
* spdylay: compile against openssl-1.1.0
  It fails to compile against openssl 1.1.0 due to things like
  |shrpx_client_handler.cc:90:30: error: 'strerror' was not declared in this scope
  |shrpx_listen_handler.cc:112:32: error: 'memset' was not declared in this scope
  |shrpx_listen_handler.cc:114:43: error: 'memcpy' was not declared in this scope
  This resolves it.
* spdycat: Fix leak in SpdySession.reqvec
* Compile with IRIX 6.5.22 using GCC-4.7.4
* Remove CREDENTIAL frame processing completely
  We just left API as is, but related functions just do nothing now.
* Allocate stream ID when spdylay_submit_{syn_stream,request} is called
  This commit allocates stream ID when spdylay_submit_syn_stream and
  spdylay_submit_request is called. Also create stream when
  spdylay_session_predicate_syn_stream_send is failed, to provide
  stream to user callback (e.g., on_ctrl_not_send_callback).
  Allocating stream ID early ensures that we can create stream because
  we can catch stream ID exhaustion early and fail fast. Since stream
  ID is allocated serially, we have to send SYN_STREAM in the order
  they queued. So now all queued syn_stream have the same priority
  (lowest). The DATA frame has given priority by application. This
  does not work well with CREDENTIAL frame, since SYN_STREAM may wait
  for CREDENTIAL, which results in out of order transmission. Since
  CREDENTIAL frame was deprecated in SPDY/3.1, and no one use it, we
  remove its functionality in the later commit.
* spdycat: --proxy-port, not --proxyport
* spdycat: Check :host header field for SNI, since Host header is not allowed
* spdycat: Update spdycat --help output for --header
* spdycat: Fix resource leak found by coverity scan