Port ctr to use client

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

cmd/ctr/events.go

@@ -1,48 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"os"
-	"text/tabwriter"
-
-	"github.com/containerd/containerd/api/services/execution"
-	"github.com/urfave/cli"
-)
-
-var eventsCommand = cli.Command{
-	Name:  "events",
-	Usage: "display containerd events",
-	Action: func(context *cli.Context) error {
-		ctx, cancel := appContext(context)
-		defer cancel()
-
-		tasks, err := getTasksService(context)
-		if err != nil {
-			return err
-		}
-		events, err := tasks.Events(ctx, &execution.EventsRequest{})
-		if err != nil {
-			return err
-		}
-		w := tabwriter.NewWriter(os.Stdout, 10, 1, 3, ' ', 0)
-		fmt.Fprintln(w, "TYPE\tID\tPID\tEXIT_STATUS")
-		for {
-			e, err := events.Recv()
-			if err != nil {
-				return err
-			}
-			if _, err := fmt.Fprintf(w,
-				"%s\t%s\t%d\t%d\n",
-				e.Type.String(),
-				e.ID,
-				e.Pid,
-				e.ExitStatus,
-			); err != nil {
-				return err
-			}
-			if err := w.Flush(); err != nil {
-				return err
-			}
-		}
-	},
-}