Sorin Sbarnea 326f902710 Finalize centos-8 migration
- assure all jobs are using centos-8
- fixed broken role-addition caused by partial centos-8 migration
- assure that touching molecule.yaml file tests role-addition, so
  we avoid future regressions

Change-Id: I18dfce4ef4d8c3bd3b73b2447fc6807047186f61
2020-03-13 10:57:49 +00:00
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2020-03-13 10:57:49 +00:00
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