Allow puppet classes to be imported by environment
|Target version:||Sprint 20|
|Found in release:||Pull request:|
|Velocity based estimate||-|
This PR allows user to import puppet classes from a specific environment manually, from both GUI and Rake.
Developers can click a button to sync the classes they recently created/updated/removed in a specific environment to Foreman, without waiting for the lengthy full class/environment sync to be finished by "ruby193-rake puppet:import:puppet_classes[batch]"