vendor: explicitly vendor golang.org/x/sys

Vendor golang.org/x/sys to get the UtimesNanoAt function defined for all
unix-like OSes. The function will be used in a successive commit.

This also re-vendors the other dependencies from glide.yaml.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

vendor/golang.org/x/crypto/ssh/channel.go

@@ -67,8 +67,6 @@ type Channel interface {
 	// boolean, otherwise the return value will be false. Channel
 	// requests are out-of-band messages so they may be sent even
 	// if the data stream is closed or blocked by flow control.
-	// If the channel is closed before a reply is returned, io.EOF
-	// is returned.
 	SendRequest(name string, wantReply bool, payload []byte) (bool, error)
 
 	// Stderr returns an io.ReadWriter that writes to this channel
@@ -219,7 +217,7 @@ func (c *channel) writePacket(packet []byte) error {
 
 func (c *channel) sendMessage(msg interface{}) error {
 	if debugMux {
-		log.Printf("send(%d): %#v", c.mux.chanList.offset, msg)
+		log.Printf("send %d: %#v", c.mux.chanList.offset, msg)
 	}
 
 	p := Marshal(msg)
@@ -373,7 +371,7 @@ func (c *channel) close() {
 	close(c.msg)
 	close(c.incomingRequests)
 	c.writeMu.Lock()
-	// This is not necessary for a normal channel teardown, but if
+	// This is not necesary for a normal channel teardown, but if
 	// there was another error, it is.
 	c.sentClose = true
 	c.writeMu.Unlock()
@@ -461,8 +459,8 @@ func (m *mux) newChannel(chanType string, direction channelDirection, extraData
 		pending:          newBuffer(),
 		extPending:       newBuffer(),
 		direction:        direction,
-		incomingRequests: make(chan *Request, chanSize),
-		msg:              make(chan interface{}, chanSize),
+		incomingRequests: make(chan *Request, 16),
+		msg:              make(chan interface{}, 16),
 		chanType:         chanType,
 		extraData:        extraData,
 		mux:              m,