Restored zmq [skip hazardlib][demos]
Restored zmq [skip hazardlib][demos]


Former-commit-id: 930330df72f0e5ecfd2744fc41126ee360f0c415 [formerly 4ee0c7472da7ac8cf21ccbc284ce2e76d8d6a7c8]
Former-commit-id: 4218eb165df59fcd5d5ef3d2b90448d34dee64ac
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine