Upgrade go version to 1.13 (#550)

Sustained Engineering

.travis.yml

@@ -1,7 +1,7 @@
 language: go
 
 go:
-  - 1.10.x
+  - 1.13.x
 
 install: pwd
 

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.10-alpine AS build-env
+FROM golang:1.13-alpine AS build-env
 WORKDIR /go/src/github.com/StackExchange/dnscontrol
 ADD . .
 RUN apk update && apk add git

azure-pipelines.yml

@@ -1,6 +1,6 @@
 variables:
   GOBIN:  '$(GOPATH)/bin' # Go binaries path
-  GOROOT: '/usr/local/go1.12' # Go installation path
+  GOROOT: '/usr/local/go1.13' # Go installation path
   GOPATH: '$(system.defaultWorkingDirectory)/gopath' # Go workspace path
   modulePath: '$(GOPATH)/src/github.com/$(build.repository.name)' # Path to the module's code
 

build/azure-pipelines/integration.yml

@@ -1,6 +1,6 @@
 variables:
   GOBIN:  '$(GOPATH)/bin' # Go binaries path
-  GOROOT: '/usr/local/go1.12' # Go installation path
+  GOROOT: '/usr/local/go1.13' # Go installation path
   GOPATH: '$(system.defaultWorkingDirectory)/gopath' # Go workspace path
   modulePath: '$(GOPATH)/src/github.com/$(build.repository.name)' # Path to the module's code
   wd: '$(modulePath)/integrationTest'

integrationTest/integration_test.go

@@ -24,6 +24,7 @@ var endIdx = flag.Int("end", 0, "Test index to stop after")
 var verbose = flag.Bool("verbose", false, "Print corrections as you run them")
 
 func init() {
+	testing.Init()
 	flag.Parse()
 }