Print the progress of operator-sdk new command

[fanminshi]

Currently, there aren't any outputs when running operator-sdk new command, I would like it to print out what it is doing like how rails does it.

For example:

$ Rails new app
      create
      create  README.md
      create  Rakefile
      create  config.ru
      create  .gitignore
      create  Gemfile
         run  git init from "."
Initialized empty Git repository in /Users/fanminshi/work/src/github.com/coreos/app/.git/
      create  app
      create  app/assets/config/manifest.js
      create  app/assets/javascripts/application.js
      create  app/assets/javascripts/cable.js
      create  app/assets/stylesheets/application.css
      create  app/channels/application_cable/channel.rb
      create  app/channels/application_cable/connection.rb
...

cc/ @hasbro17 @hongchaodeng

[hasbro17]

This kind of output is definitely something that we would want in the future but is not strictly necessary for the first milestone. So we can revisit this when we other more urgent issues resolved.

[fanminshi]

yeah, we can do this in a future milestone or based on the feedback from user. not urgent at the moment.