Merge pull request #8449 from gyuho/go1.9

*: bump up to Go 1.9 in tests

.travis.yml

@@ -4,7 +4,7 @@ go_import_path: github.com/coreos/etcd
 sudo: false
 
 go:
-  - 1.8.3
+  - 1.9
   - tip
 
 notifications:
@@ -56,6 +56,7 @@ before_install:
  - go get -v -u honnef.co/go/tools/cmd/unused
  - go get -v -u honnef.co/go/tools/cmd/staticcheck
  - ./scripts/install-marker.sh amd64
+ - export GOROOT=$(go env GOROOT)
 
 # disable godep restore override
 install:

e2e/docker/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.8.3-stretch
+FROM golang:1.9-stretch
 LABEL Description="Image for etcd DNS testing"
 RUN apt update -y
 RUN go get github.com/mattn/goreman