Fix Debian Release file headers

This fixes Debian's Release file headers when mirrored by reprepro.
Especially, this patch adds NotAutomatic and ButAutomaticUpgrades
headers needed to correctly setup a backport repository.

Change-Id: I5e0c2f11362cdb59bfd0c36ee148bf5d8aab43db

modules/openstack_project/templates/reprepro/distributions.debian.erb

@@ -1,5 +1,7 @@
 <% @releases.each do |release| -%>
 Origin: Debian
+Label: Debian
+Suite: stable
 Codename: <%= release %>
 Description: OpenStack Debian <%= release.capitalize %> mirror
 Architectures: amd64 arm64 source
@@ -10,6 +12,8 @@ Update: debian
 Log: <%= @logdir %>/debian-<%= release %>.log
 
 Origin: Debian
+Label: Debian
+Suite: stable-updates
 Codename: <%= release %>-updates
 Description: OpenStack Debian <%= release.capitalize %> Updates mirror
 Architectures: amd64 arm64 source
@@ -19,8 +23,12 @@ Contents: .gz
 Update: debian
 Log: <%= @logdir %>/debian-<%= release %>-updates.log
 
-Origin: Debian
+Origin: Debian Backports
+Label: Debian Backports
+Suite: <%= release %>-backports
 Codename: <%= release %>-backports
+NotAutomatic: yes
+ButAutomaticUpgrades: yes
 Description: OpenStack Debian <%= release.capitalize %> Backports mirror
 Architectures: amd64 arm64 source
 Components: main