[cmd] Can register command in RootCmd.Execute
[cmd] Can register command in RootCmd.Execute

- the main function call Execute to actually run cobra, and at that
  time the configuration file is properly loaded, command line arguments are parsed
  but you can't access it from cobra I guess?
- NOTE: initConfig is actually a global pre run for each command, so it
  works when run `Ayi help`, but won't work for `Ayi dummy`

dyweb/Ayi