cmd: don't alias context package, and use cliContext for cli.Context

Unfortunately, this is a rather large diff, but perhaps worth a one-time
"rip off the bandaid" for v2. This patch removes the use of "gocontext"
as alias for stdLib's "context", and uses "cliContext" for uses of
cli.context.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cmd/ctr/commands/tasks/ps.go

@@ -31,12 +31,12 @@ var psCommand = &cli.Command{
 	Name:      "ps",
 	Usage:     "List processes for container",
 	ArgsUsage: "CONTAINER",
-	Action: func(context *cli.Context) error {
-		id := context.Args().First()
+	Action: func(cliContext *cli.Context) error {
+		id := cliContext.Args().First()
 		if id == "" {
 			return errors.New("container id must be provided")
 		}
-		client, ctx, cancel, err := commands.NewClient(context)
+		client, ctx, cancel, err := commands.NewClient(cliContext)
 		if err != nil {
 			return err
 		}