Add alternate-mdx/mdserver/mdproxy

inventory/group_vars/all.yml

playbook.yml

roles/alternate-mdx/defaults/main.yml

roles/alternate-mdx/tasks/main.yml

roles/mdproxy/handlers/main.yml

roles/mdproxy/tasks/main.yml

roles/mdproxy/templates/mdproxy.service.j2

roles/mdproxy/templates/mdproxy.yaml.j2

roles/mdserver/handlers/main.yml

roles/mdserver/tasks/main.yml

roles/mdserver/templates/mdserver.service.j2

roles/mdserver/templates/mdserver.yaml.j2