Rename start to run

`runc run` is the command that will create and start a container in one
single command.

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

main.go

@@ -96,8 +96,8 @@ func main() {
 		psCommand,
 		restoreCommand,
 		resumeCommand,
+		runCommand,
 		specCommand,
-		startCommand,
 		stateCommand,
 		updateCommand,
 	}