This patch updates the auto-generated code to match the latest tooling
versions.
In particular, the protobufs are regenerated, and the new version no
longer supports unkeyed literals, so some minor changes are needed.
Other than that, the cipher list is extended with the latest ciphers.
This is just a run of "go generate ./..." which re-generates the protocol
buffers code.
There is no actual change in the logic or APIs, it's just a rebuild with a
newer proto compiler. While it's not strictly necessary, it will help make
subsequent patches cleaner.
