Update attributes to be rubocop compliant

- Update rubocop config to handle entire repo in one file
- Update Strainerfile to run rubocop only once
- Update attributes to comply with rubocop

Change-Id: I6b164846c57edf3f5bbc0296d68613c7cac83396
Addresses: blueprint rubocop-for-compute
Merge "Update attributes to be rubocop compliant"