Will enable it again when spdycat and spdyd are ready for http/2.0

fix building on mac os x. "error: invalid suffix on literal; C++11 requires a space between literal and identifier"

It is unnecessary because spdy version at this point is always valid.

shrpx:
* Added an option to set the TLS SNI extension between shrpx and the
  origin on the command line

spdycat:
* If the user set an explicit host header ( using --headers ) use that
  name for the TLS SNI extension.
* Added the handshake completion time to the verbose output
* The gettimeofday call in get_time was using the incorrect structure
  ( I believe )
* In update_html_parser it was submitting the request regardless of
  the return value of add_request.

Patch from Stephen Ludin

This check is done in spdylay_submit_* family functions and they will
return error if they found control characters.

SPDY spec does not allow multiple empty header values in one header
field. This change makes out-going framer ignore such empty header
value if there is non-empty header value with the same name.

This change fixes the bug that spdylay_frame_unpack_nv does not check
the size of header value if it is the last value in NULL separated
list.