stubbed out more of the mixin workflow
stubbed out more of the mixin workflow


Former-commit-id: 90784a9fe865a28cb9e7f511b48a6c749055e84e [formerly 3b3d6ca2ab5c0384c2e3dd7479d84a32c5a546e4]
Former-commit-id: 15e17ce091bc55d4ad47cfbfe76fe842d5eb3601
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine