etcd: Bump to etcd v3.3 and golang 1.9

This moves us to etcd v3.3 (a new major release) which has some useful
features but that requires version 1.9 of golang.

.travis.yml

@@ -3,7 +3,6 @@ os:
   - linux
   - osx
 go:
-  - 1.8.x
   - 1.9.x
   - tip
 go_import_path: github.com/purpleidea/mgmt
@@ -19,7 +18,6 @@ matrix:
   fast_finish: false
   allow_failures:
     - go: tip
-    - go: 1.9.x
     - os: osx
 notifications:
   irc:

docker/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.8
+FROM golang:1.9
 
 MAINTAINER Michał Czeraszkiewicz <contact@czerasz.com>
 

docker/Dockerfile.development

@@ -1,4 +1,4 @@
-FROM golang:1.8
+FROM golang:1.9
 
 MAINTAINER Michał Czeraszkiewicz <contact@czerasz.com>
 

docs/quick-start-guide.md

@@ -11,7 +11,7 @@ Once you're familiar with the general idea, please start hacking...
 ## Quick start
 
 ### Installing golang
-* You need golang version 1.8 or greater installed.
+* You need golang version 1.9 or greater installed.
 ** To install on rpm style systems: `sudo dnf install golang`
 ** To install on apt style systems: `sudo apt install golang`
 ** To install on macOS systems install [Homebrew](https://brew.sh) and run: `brew install go`
@@ -64,7 +64,7 @@ dependencies, _runtime_ dependencies, and additionally, a few extra dependencies
 required for running the _test_ suite.
 
 ### Build
-* `golang` 1.8 or higher (required, available in some distros and distributed
+* `golang` 1.9 or higher (required, available in some distros and distributed
   as a binary officially by [golang.org](https://golang.org/dl/))
 
 ### Runtime

prometheus/prometheus.go

@@ -144,7 +144,7 @@ func (obj *Prometheus) Start() error {
 
 // Stop the http server.
 func (obj *Prometheus) Stop() error {
-	// TODO: There is no way in go < 1.8 to stop a http server.
+	// FIXME: There is no way in go < 1.8 to stop a http server. Add this!
 	// https://stackoverflow.com/questions/39320025/go-how-to-stop-http-listenandserve/41433555#41433555
 	return nil
 }