use a variable to define rabbitmq username
use a variable to define rabbitmq username


Former-commit-id: 33abc887f6a384f83143bd452e019306a9cd16c2 [formerly 6a9147cba806c3df7f224049030ec40722272fab]
Former-commit-id: 6f4fa9e5bf62b768e2e0094ec844676c21145f84
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine