Update spec files to be rubocop compliant

- Update .rubocop.yml to include spec/**
- Update metadata.rb to be rubocop compliant
- Update spec files to be rubocop compliant

Change-Id: If059f01f46102282ffeed9323f6e06fa78f8597c
Addresses: blueprint rubocop-for-ops-database
Clean up cookbook for bp/clean-up-attr-for-mq-and-db

This change removes the attributes we'll be moving to openstack-common
and changes reference of those attributes to reflect new (more
consistent) namespace.

Change-Id: I5f324ed2494a643d27bb2922361e21f4a1ce2a1f
Implements: blueprint clean-up-attr-for-mq-and-db
Update recipes to be rubocop compliant

- Update .rubocop.yml to include recipes/**
- Update recipes to be rubocop compliant

Change-Id: Ibb2113e266427b1d9b509d1e66389462e1ff0189
Addresses: blueprint rubocop-for-ops-database