silence warnings due to lack of handlers for the amqplib logger
silence warnings due to lack of handlers for the amqplib logger


Former-commit-id: be4bcd41c9e29dd75bcd2a5f61e1e1f3d55bc27b [formerly be4bcd41c9e29dd75bcd2a5f61e1e1f3d55bc27b [formerly ee6f87912299369bcce79443c5fdf142bb10ebb3]]
Former-commit-id: b5d6740665ff6a55bd41a7198330b6bae9cdee7c
Former-commit-id: 98729e082d45f28cfc187f6917fb3ee20b57fd0b
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine