Templatize puppet projects in layout.yaml

Introduce new job-group puppet-check-jobs for jjb and use it everywhere.

Introduce new templates puppet-check-jobs and puppet-module-unit-jobs
in layout.yaml and use them where possible.

Change-Id: I6d827f7d381fb37516bf78cd9c0ca2570ba258f6
Merge "Templatize puppet projects in layout.yaml"