all: fix plugin import ordering (#1717)

Got a bit messed up with stb lib "context" usage.

plugin/proxy/dns.go

@@ -1,13 +1,12 @@
 package proxy
 
 import (
+	"context"
 	"net"
 	"time"
 
 	"github.com/coredns/coredns/request"
 
-	"context"
-
 	"github.com/miekg/dns"
 )
 

plugin/proxy/dnstap.go

@@ -1,14 +1,13 @@
 package proxy
 
 import (
+	"context"
 	"time"
 
 	"github.com/coredns/coredns/plugin/dnstap"
 	"github.com/coredns/coredns/plugin/dnstap/msg"
 	"github.com/coredns/coredns/request"
 
-	"context"
-
 	tap "github.com/dnstap/golang-dnstap"
 	"github.com/miekg/dns"
 )

plugin/proxy/dnstap_test.go

@@ -1,6 +1,7 @@
 package proxy
 
 import (
+	"context"
 	"testing"
 	"time"
 
@@ -9,8 +10,6 @@ import (
 	mwtest "github.com/coredns/coredns/plugin/test"
 	"github.com/coredns/coredns/request"
 
-	"context"
-
 	tap "github.com/dnstap/golang-dnstap"
 	"github.com/miekg/dns"
 )

plugin/proxy/exchanger.go

@@ -1,10 +1,10 @@
 package proxy
 
 import (
-	"github.com/coredns/coredns/request"
-
 	"context"
 
+	"github.com/coredns/coredns/request"
+
 	"github.com/miekg/dns"
 )
 

plugin/proxy/google.go

@@ -1,6 +1,7 @@
 package proxy
 
 import (
+	"context"
 	"crypto/tls"
 	"encoding/json"
 	"fmt"
@@ -14,8 +15,6 @@ import (
 	"github.com/coredns/coredns/plugin/pkg/log"
 	"github.com/coredns/coredns/request"
 
-	"context"
-
 	"github.com/miekg/dns"
 )
 

plugin/proxy/grpc.go

@@ -1,6 +1,7 @@
 package proxy
 
 import (
+	"context"
 	"crypto/tls"
 	"fmt"
 
@@ -9,8 +10,6 @@ import (
 	"github.com/coredns/coredns/plugin/pkg/trace"
 	"github.com/coredns/coredns/request"
 
-	"context"
-
 	"github.com/grpc-ecosystem/grpc-opentracing/go/otgrpc"
 	"github.com/miekg/dns"
 	opentracing "github.com/opentracing/opentracing-go"

plugin/proxy/grpc_test.go

@@ -1,6 +1,7 @@
 package proxy
 
 import (
+	"context"
 	"fmt"
 	"testing"
 
@@ -9,8 +10,6 @@ import (
 	"github.com/coredns/coredns/plugin/test"
 	"github.com/coredns/coredns/request"
 
-	"context"
-
 	"github.com/miekg/dns"
 	"google.golang.org/grpc/grpclog"
 )

plugin/proxy/lookup.go

@@ -3,6 +3,7 @@ package proxy
 // functions other plugin might want to use to do lookup in the same style as the proxy.
 
 import (
+	"context"
 	"fmt"
 	"net"
 	"sync/atomic"
@@ -11,8 +12,6 @@ import (
 	"github.com/coredns/coredns/plugin/pkg/healthcheck"
 	"github.com/coredns/coredns/request"
 
-	"context"
-
 	"github.com/miekg/dns"
 )
 

plugin/proxy/proxy.go

@@ -2,6 +2,7 @@
 package proxy
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"net"
@@ -13,8 +14,6 @@ import (
 	"github.com/coredns/coredns/plugin/pkg/healthcheck"
 	"github.com/coredns/coredns/request"
 
-	"context"
-
 	"github.com/miekg/dns"
 	ot "github.com/opentracing/opentracing-go"
 )