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/info/info.go

@@ -30,8 +30,8 @@ type Info struct {
 var Command = &cli.Command{
 	Name:  "info",
 	Usage: "Print the server info",
-	Action: func(context *cli.Context) error {
-		client, ctx, cancel, err := commands.NewClient(context)
+	Action: func(cliContext *cli.Context) error {
+		client, ctx, cancel, err := commands.NewClient(cliContext)
 		if err != nil {
 			return err
 		}