internal/iana: update protocol numbers

Also fixes parseProtocolNumbers to make it possible to grab the recently
added keyword "deprecated" correctly.

Change-Id: I431da33a722eab9aa13ce1834acab4e9e6346bfd
Reviewed-on: https://go-review.googlesource.com/2852
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2 files changed