Add rewrite rule to access specific parts of the mirrorlist

The MM1 publiclist links are supposed to still work. If an old
publiclist link tries to directly access a product/version or
product/version/arch combination an additional 'mirrors' needs to be
inserted into the link. For full MM1 compatibility following PR is
necessary:

https://github.com/fedora-infra/mirrormanager2/pull/76

roles/mirrormanager/mirrorlist2/templates/mirrorlist-server.conf

@@ -3,9 +3,13 @@
 #
 {% if env == "staging" %}
 Redirect /publiclist https://admin.stg.fedoraproject.org/mirrormanager
+RewriteEngine On
+RewriteRule ^/publiclist/(.+[^/])/?$ https://admin.stg.fedoraproject.org/mirrormanager/mirrors/$1 [R,L]
 {% else %}
 Redirect /publiclist https://admin.fedoraproject.org/mirrormanager
 Alias /static /var/lib/mirrormanager/mirrorlists/static/
+RewriteEngine On
+RewriteRule ^/publiclist/(.+[^/])/?$ https://admin.fedoraproject.org/mirrormanager/mirrors/$1 [R,L]
 {% endif %}
 
 <Directory /var/lib/mirrormanager/mirrorlists>