[3] Detect possible dead code in fabric8-analytics repositories

[tisnik]

Planner issue: https://openshift.io/openshiftio/openshiftio/plan/detail/2615

We'd need to improve code quality by detecting (and removing) all dead code found in fabric8-analytics repositories. It can't be done fully automatically because of highly dynamic nature of Python and also because some tasks are executed via flow declaration created outside actual sources. OTOH simple cases might be covered.

Acceptance criteria

All following repositories are checked by new script(s):

• f8a-server-backbone
• fabric8-analytics-api-gateway
• fabric8-analytics-auth
• fabric8-analytics-data-model
• fabric8-analytics-ingestion
• fabric8-analytics-jobs
• fabric8-analytics-license-analysis
• fabric8-analytics-npm-insights
• fabric8-analytics-nvd-toolkit
• fabric8-analytics-server
• fabric8-analytics-stack-analysis
• fabric8-analytics-tagger
• fabric8-analytics-version-comparator
• fabric8-analytics-worker
• fabric8-gemini-server

Note for devels/QA

We might try to use vulture
https://pypi.org/project/vulture/