Update TLS Ciphers for Go 1.8

[kekoav]

See #1268 . This is an update to include all supported TLS ciphers in Go 1.8.

There are no cipher removals, only additions.

[timoreimann]

LGTM.

@emilevauge?

[errm]

LGTM based on rebasing this on master once #1259 is merged ...

[kostyrev]

when will this be released?

[timoreimann]

The upcoming 1.3 release will have it.

[kostyrev]

That is the release cadence?

[timoreimann]

I think it's scheduled for some time at the end of this month. We're still in the process to finding a good cadence, hence we haven't published release schedules yet (but will do so eventually).

[kostyrev]

thanks for letting me know!

[jacobsvante]

I'm a bit worried that the list of ciphers fall behind what's actually available. Perhaps a more dynamic way of extracting what Go supports would be in place?

[timoreimann]

@jmagnusson we might be able to use reflection to achieve that. Alternatively, we put a big red sign right before the Go version specifier in the Go builder Docker image we use that says something like "do not update without updating the TLS ciphers too".

Regardless of what the best approach is, you are raising a valid point. Would you mind filing an issue?