previous behavior used class { 'stdlib::stages':} which isn't singleton and could cause duplication resource declaration on the stages class.
Since many community modules work by calling 'include stdlib' we should make stdlib's include of stages singleton as well.
Many modules I'm working on need a standard but
relatively granular location in the catalog. For example,
any module that configures the packaging system should
run "early"
Add the following stages which have inter-dependencies
in the top to bottom order listed:
* setup
* deploy
* runtime
* setup_infra
* deploy_infra
* main
* setup_app
* deploy_app
