global: move to context (#1699)

* global: move to context

Move from golang.org/x/net/context to std lib's context.

Change done with:

for i in $(grep -l '/context' **/*.go); do sed -e 's|golang.org/x/net/context|context|' -i $i; echo $i; done
for i in **/*.go; do goimports -w $i; done

* drop from dns.pb.go as well

plugin/kubernetes/handler.go

@@ -5,8 +5,9 @@ import (
 	"github.com/coredns/coredns/plugin/pkg/dnsutil"
 	"github.com/coredns/coredns/request"
 
+	"context"
+
 	"github.com/miekg/dns"
-	"golang.org/x/net/context"
 )
 
 // ServeDNS implements the plugin.Handler interface.

plugin/kubernetes/handler_pod_disabled_test.go

@@ -6,8 +6,9 @@ import (
 	"github.com/coredns/coredns/plugin/pkg/dnstest"
 	"github.com/coredns/coredns/plugin/test"
 
+	"context"
+
 	"github.com/miekg/dns"
-	"golang.org/x/net/context"
 )
 
 var podModeDisabledCases = []test.Case{

plugin/kubernetes/handler_pod_insecure_test.go

@@ -6,8 +6,9 @@ import (
 	"github.com/coredns/coredns/plugin/pkg/dnstest"
 	"github.com/coredns/coredns/plugin/test"
 
+	"context"
+
 	"github.com/miekg/dns"
-	"golang.org/x/net/context"
 )
 
 var podModeInsecureCases = []test.Case{

plugin/kubernetes/handler_pod_verified_test.go

@@ -6,8 +6,9 @@ import (
 	"github.com/coredns/coredns/plugin/pkg/dnstest"
 	"github.com/coredns/coredns/plugin/test"
 
+	"context"
+
 	"github.com/miekg/dns"
-	"golang.org/x/net/context"
 )
 
 var podModeVerifiedCases = []test.Case{

plugin/kubernetes/handler_test.go

@@ -7,8 +7,9 @@ import (
 	"github.com/coredns/coredns/plugin/pkg/dnstest"
 	"github.com/coredns/coredns/plugin/test"
 
+	"context"
+
 	"github.com/miekg/dns"
-	"golang.org/x/net/context"
 	api "k8s.io/api/core/v1"
 	meta "k8s.io/apimachinery/pkg/apis/meta/v1"
 )

plugin/kubernetes/kubernetes_apex_test.go

@@ -6,8 +6,9 @@ import (
 	"github.com/coredns/coredns/plugin/pkg/dnstest"
 	"github.com/coredns/coredns/plugin/test"
 
+	"context"
+
 	"github.com/miekg/dns"
-	"golang.org/x/net/context"
 )
 
 var kubeApexCases = []test.Case{

plugin/kubernetes/reverse_test.go

@@ -6,8 +6,9 @@ import (
 	"github.com/coredns/coredns/plugin/pkg/dnstest"
 	"github.com/coredns/coredns/plugin/test"
 
+	"context"
+
 	"github.com/miekg/dns"
-	"golang.org/x/net/context"
 	api "k8s.io/api/core/v1"
 	meta "k8s.io/apimachinery/pkg/apis/meta/v1"
 )

plugin/kubernetes/xfr.go

@@ -10,8 +10,9 @@ import (
 	"github.com/coredns/coredns/plugin/pkg/log"
 	"github.com/coredns/coredns/request"
 
+	"context"
+
 	"github.com/miekg/dns"
-	"golang.org/x/net/context"
 	api "k8s.io/api/core/v1"
 )
 

plugin/kubernetes/xfr_test.go

@@ -4,9 +4,10 @@ import (
 	"strings"
 	"testing"
 
+	"context"
+
 	"github.com/coredns/coredns/plugin/pkg/dnstest"
 	"github.com/coredns/coredns/plugin/test"
-	"golang.org/x/net/context"
 	api "k8s.io/api/core/v1"
 	meta "k8s.io/apimachinery/pkg/apis/meta/v1"