Do not fail installation if rabbitmq user creation fails and redirect standard output to /dev/null
Do not fail installation if rabbitmq user creation fails
and redirect standard output to /dev/null


Former-commit-id: 1355e3a07de3356eea0eec0b3a73a514ba1a7a95 [formerly 1355e3a07de3356eea0eec0b3a73a514ba1a7a95 [formerly 6e3e956539a4849a3ee5a614473fbd4c8cfc3714]]
Former-commit-id: 0893f989b372e8a62873e21e09ae61c9e6656be6
Former-commit-id: b80d3068a982ac5778b51108013ec0880d903c79
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine