Update links for RabbitMQ plugins
Update links for RabbitMQ plugins

Update links for rabbitmq_amqp, rabbitmq_auth_backend_http, rabbitmq_auth_mechanism_ssl and rabbitmq_consistent_hash_exchange
rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website