Proposed rabbitmq defaults and vars

defaults_main.yml

rabbitmq_package_url: "{{ _rabbitmq_package_url }}"
rabbitmq_package_version: "{{ _rabbitmq_package_version }}"
rabbitmq_release_version: "{{ _rabbitmq_release_version }}"
rabbitmq_package_sha256: "{{ _rabbitmq_package_sha256 }}"
rabbitmq_package_path: "{{ _rabbitmq_package_path }}"

tests_test-vars.yml

rabbitmq_old_package:
  debian:
    rabbitmq_package_url: "https://www.rabbitmq.com/releases/rabbitmq-server/v3.5.7/rabbitmq-server_3.5.7-1_all.deb"
    rabbitmq_package_sha256: "b8a42321c2f2689dc579911fbb583bd9c4d2ce2f20003d7050d5a324a6d2de42"
  redhat:
    rabbitmq_package_url: "http://www.rabbitmq.com/releases/rabbitmq-server/v3.5.7/rabbitmq-server-3.5.7-1.noarch.rpm"
    rabbitmq_package_sha256: "5469b049d6444d95d917634da1e167cb678060920faec606788804a63356ba40"

tests_test.yml

# Install previous version of RabbitMQ server
- include: test-install-rabbitmq-server.yml
  vars:
    rabbitmq_package_url: rabbitmq_old_package["{{ ansible_os_family | lower }}"]["rabbitmq_package_url"]
    rabbitmq_package_sha256: rabbitmq_old_package["{{ ansible_os_family | lower }}"]["rabbitmq_package_sha256"]
  vars_files:
    test-vars.yml

vars_debian.yml

_rabbitmq_package_url: "https://www.rabbitmq.com/releases/rabbitmq-server/v3.6.1/rabbitmq-server_3.6.1-1_all.deb"
_rabbitmq_package_version: "{{ rabbitmq_package_url.split('/')[-1].split('_')[1] }}"
_rabbitmq_release_version: "{{ rabbitmq_package_version.split('-')[0] }}"
_rabbitmq_package_sha256: "0728fbdb14ec62712c6f931a7d91648cafbc6c30d8d4da790832e784b4d2e956"
_rabbitmq_package_path: "/opt/rabbitmq-server.deb"

vars_redhat.yml

_rabbitmq_package_url: "https://www.rabbitmq.com/releases/rabbitmq-server/v3.6.1/rabbitmq-server-3.6.1-1.noarch.rpm"
_rabbitmq_package_version: "{{ rabbitmq_package_url.split('/')[-1].rsplit('.', 1)[0] }}"
_rabbitmq_release_version: "{{ rabbitmq_package_version.split('-')[2] }}"
_rabbitmq_package_sha256: "b688950915289a8596bdce35086b00ad08ee0e32567396c5bda850854642fac7"
_rabbitmq_package_path: "/opt/rabbitmq-server.rpm"