Added helper method to get the default openquake user.
Added helper method to get the default openquake user.


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Former-commit-id: f463443faf37fe169f3670a710e430e89ea30381
Former-commit-id: 41d8d90e05a023f50beafd542443502aaef991e8
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine