Updating to golang 1.12

[mpawliszyn]

Signed-off-by: Michael Pawliszyn mikepaw@squareup.com

[mpawliszyn]

The reason why I want this is to try out what should be better performance on TLS1.3 as well as there have been some general buffer and other changes to crypto/tls

I'm digging into the CPU performance and there is something around networks Syscalls. For this investigation to be useful it only really makes sense if I'm digging into the recent versions of these files.

[derekperkins]

Not sure if all these spots are relevant, but this was the PR for bumping to 1.11 https://github.com/vitessio/vitess/pull/4246/files

[mpawliszyn]

Not sure if all these spots are relevant, but this was the PR for bumping to 1.11 https://github.com/vitessio/vitess/pull/4246/files

Ok I've added all the places from this PR now too

[sougou]

Conflicts need to be resolved.

[morgo]

The docs moved to vitessio/website -- these two .md files being here was just legacy. They've since been removed.

[mpawliszyn]

@sougou I think the conflicts have been fixed.