Old repo (ppa1.rabbitmq.com) was put down in favor of deb1.rabbitmq.com, so we need to switch to it for erlang installation as well. Change-Id: I1bbb4b5a685cc6526e33fde429085d8ec8198c5d Signed-off-by: Dmitriy Rabotyagov <dmitriy.rabotyagov@cleura.com>