Corrections for weaknesses in Vagrant code, bugs
Corrections for weaknesses in Vagrant code, bugs

- Coherent usage of IP addresses between hosts role and Vagrant nodes.js
- Force older version of Jenkins
- use vagrant as username for generic vagrant usage
- use OpenJDK-8 in stead of Oracle JDK
- cosmetic corrections in ReadMe's
- fall bsck to jenkins 1.651.3
- pinning of all jenkins plugins
- ansible lint checks

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