Current code de-facto ignores rabbitmq_erlang_install_method variable value for debian-based distros. We need to use it for erlang repo installation, otherwise it may lead to role failure. Change-Id: I826fec7febe3bda5748a0e90fa80fdb8586d63ac Signed-off-by: Dmitriy Rabotyagov <dmitriy.rabotyagov@cleura.com>