Update ttrpc to support context timeout.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>

vendor/github.com/containerd/ttrpc/client.go

@@ -24,6 +24,7 @@ import (
 	"strings"
 	"sync"
 	"syscall"
+	"time"
 
 	"github.com/gogo/protobuf/proto"
 	"github.com/pkg/errors"
@@ -86,6 +87,10 @@ func (c *Client) Call(ctx context.Context, service, method string, req, resp int
 		cresp = &Response{}
 	)
 
+	if dl, ok := ctx.Deadline(); ok {
+		creq.TimeoutNano = dl.Sub(time.Now()).Nanoseconds()
+	}
+
 	if err := c.dispatch(ctx, creq, cresp); err != nil {
 		return err
 	}
@@ -104,6 +109,7 @@ func (c *Client) Call(ctx context.Context, service, method string, req, resp int
 func (c *Client) dispatch(ctx context.Context, req *Request, resp *Response) error {
 	errs := make(chan error, 1)
 	call := &callRequest{
+		ctx:  ctx,
 		req:  req,
 		resp: resp,
 		errs: errs,