Use Go 1.10.x for 3.3 release to support crypto/x509 "name constraints"

[cultcom]

The official etcd binaries found on github.com are compiled with golang version 1.9:
~# etcd --version
etcd Version: 3.3.8
Git SHA: 33245c6
Go Version: go1.9.7
Go OS/Arch: linux/amd64

Unfortunately this golang version does not support nameConstraints correctly according to golang/go#15196

So please update your build process to utilize golang 1.10 for further releases.

[hexfusion]

confirmed @gyuho @xiang90 @jpbetz

[hexfusion]

@cultcom, thank you for the report.

[gyuho]

@cultcom We will use Go 1.10 or 1.11 for 3.4 release, which is a few months away. And we do not bump up Go versions in our stable release branches. Are you trying to use name constraints in production?

[cultcom]

well, the locally used CA had them configured but now I deactivated that until etcd comes compiled with golang 1.10 ;-)

[gyuho]

@cultcom Could you try building release-3.3 branch with latest Go 1.10 and see if it resolves your issue? Then, we will try benchmark 3.3 branch with Go 1.10 to see if it would introduce any regressions. If numbers looks good, we should be safe to bump up Go version in 3.3 releases.

[cultcom]

@gyuho Yes, I did that yesterday and it fixed the issue:
etcd Version: 3.3.8
Git SHA: GitNotFound
Go Version: go1.10.3
Go OS/Arch: linux/amd64

I build the official 3.3.8 source package from github (not the cloned repo).

FYI: Ubuntu 18.04 comes officially with 3.2.17 which is compiled with golang 1.10.

[gyuho]

@cultcom Thanks. We will try bumping up the Go version in the next 3.3 release.

[cultcom]

@gyuho Thanks.

[gyuho]

benchmark put \
  --clients 1000 \
  --conns 100 \
  --total 1000000 \
  --key-size 200 \
  --val-size 1024 \
  --sequential-keys


Go 1.9.7

Summary:
  Total:	58.8737 secs.
  Slowest:	0.2854 secs.
  Fastest:	0.0020 secs.
  Average:	0.0585 secs.
  Stddev:	0.0254 secs.
  Requests/sec:	16985.5217

Response time histogram:
  0.0020 [1]	|
  0.0304 [60692]	|∎∎∎∎
  0.0587 [524933]	|∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎
  0.0870 [315454]	|∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎
  0.1154 [74300]	|∎∎∎∎∎
  0.1437 [13117]	|
  0.1721 [4484]	|
  0.2004 [2144]	|
  0.2288 [3707]	|
  0.2571 [898]	|
  0.2854 [270]	|

Latency distribution:
  10% in 0.0335 secs.
  25% in 0.0415 secs.
  50% in 0.0536 secs.
  75% in 0.0704 secs.
  90% in 0.0869 secs.
  95% in 0.0989 secs.
  99% in 0.1529 secs.
  99.9% in 0.2306 secs.


Go 1.10.3

Summary:
  Total:	52.5230 secs.
  Slowest:	0.3442 secs.
  Fastest:	0.0016 secs.
  Average:	0.0515 secs.
  Stddev:	0.0268 secs.
  Requests/sec:	19039.2841

Response time histogram:
  0.0016 [1]	|
  0.0358 [264681]	|∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎
  0.0701 [572196]	|∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎
  0.1044 [139536]	|∎∎∎∎∎∎∎∎∎
  0.1386 [7131]	|
  0.1729 [4462]	|
  0.2071 [6883]	|
  0.2414 [3665]	|
  0.2757 [704]	|
  0.3099 [671]	|
  0.3442 [70]	|

Latency distribution:
  10% in 0.0278 secs.
  25% in 0.0352 secs.
  50% in 0.0461 secs.
  75% in 0.0622 secs.
  90% in 0.0777 secs.
  95% in 0.0877 secs.
  99% in 0.1850 secs.
  99.9% in 0.2590 secs.

Better performance with Go 1.10 as well. Will set Go version to 1.10 in our 3.3 branch.