disable the mandatory http 1.1 requirement as we dont want to fall back to it if the spdy connection fails
Revert "disable the mandatory http 1.1 requirement as we dont want to fall back to it if the spdy connection fails"

This reverts commit 7680c48fca579a6aeec63560a90873c938657c82.
add a dontRetry param to the request object to stop okhttp trying to retry for us
add setter
dont do any recovery stuff if request.dontRetry is true
Add request trailers for duration