debian/postinst: setup rabbitmq only if it's running
debian/postinst: setup rabbitmq only if it's running


Former-commit-id: 8462f07178306aed7bebc02e0901ba2167e16aaf [formerly d07d24faff2085d78da7b9d1dc50ae074903861a] [formerly d07d24faff2085d78da7b9d1dc50ae074903861a [formerly b4a7c55982438c09322d6bf2bef832b4779b8fc6]]
Former-commit-id: d12d584cb02ca4faf9f2567c242a384a4df6f9a4
Former-commit-id: bf379ea3c26fe8f670d9b664d0937e80e6613caa
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine