p9p: use new context package throughout

Signed-off-by: Stephen J Day <[email protected]>

Author: stevvooe

Diff for: .travis.yml

@@ -1,7 +1,7 @@
 language: go
 
 go:
-  - 1.6
+  - 1.7
 
 script:
   - go test -coverprofile=coverage.txt -covermode=atomic -race

Diff for: channel.go

@@ -10,7 +10,7 @@ import (
 	"net"
 	"time"
 
-	"golang.org/x/net/context"
+	"context"
 )
 
 // Channel defines the operations necessary to implement a 9p message channel

Diff for: client.go

@@ -3,7 +3,7 @@ package p9p
 import (
 	"net"
 
-	"golang.org/x/net/context"
+	"context"
 )
 
 type client struct {

Diff for: context.go

@@ -1,7 +1,7 @@
 package p9p
 
 import (
-	"golang.org/x/net/context"
+	"context"
 )
 
 type contextKey string

Diff for: dispatcher.go

@@ -1,6 +1,6 @@
 package p9p
 
-import "golang.org/x/net/context"
+import "context"
 
 // Handler defines an interface for 9p message handlers. A handler
 // implementation could be used to intercept calls of all types before sending

Diff for: readdir.go

@@ -3,7 +3,7 @@ package p9p
 import (
 	"io"
 
-	"golang.org/x/net/context"
+	"context"
 )
 
 // ReaddirAll reads all the directory entries for the resource fid.

Diff for: server.go

@@ -7,7 +7,7 @@ import (
 	"sync"
 	"time"
 
-	"golang.org/x/net/context"
+	"context"
 )
 
 // TODO(stevvooe): Add net/http.Server-like type here to manage connections.

Diff for: session.go

@@ -1,6 +1,6 @@
 package p9p
 
-import "golang.org/x/net/context"
+import "context"
 
 // Session provides the central abstraction for a 9p connection. Clients
 // implement sessions and servers serve sessions. Sessions can be proxied by

Diff for: transport.go

@@ -7,7 +7,7 @@ import (
 	"net"
 	"sync"
 
-	"golang.org/x/net/context"
+	"context"
 )
 
 // roundTripper manages the request and response from the client-side. A

Diff for: version.go

@@ -3,7 +3,7 @@ package p9p
 import (
 	"fmt"
 
-	"golang.org/x/net/context"
+	"context"
 )
 
 // NOTE(stevvooe): This file contains functions for negotiating version on the