Enable rubocop security cop scan on ruby projects

Rubocop is a scanner for checking some violations including some security relevant.
Although a number of repo's were intended to undergo rubocop scans as part of regular CI processes, but the tool's configuration file have not been kept uptodate. As a result the scans were getting skipped.

This ticket captures work needed to revive scans for some high risk projects. Tentatively rubocop scans would be enabled on following repo's:

• puppet
• marionette-collective