Expand multibuild flavors by default

We do this to be consistent with the behaviour showed when passing a
remote project.

Fixes openSUSE#16911

src/api/app/controllers/source_project_controller.rb

@@ -52,7 +52,8 @@ def render_project_issues
   end
 
   def render_project_packages
-    @packages = params.key?(:expand) ? @project.expand_all_packages : @project.packages.pluck(:name)
+    # TODO: Mirar expand_all_packages
+    @packages = params.key?(:expand) ? @project.expand_all_packages : @project.packages
     render locals: { expand: params.key?(:expand) }, formats: [:xml]
   end
 

src/api/app/views/source_project/show.xml.builder

@@ -1,9 +1,16 @@
 xml.directory(count: @packages.count) do
-  @packages.map do |name, project|
+  @packages.sort_by(&:name).map do |package, project|
     if expand
-      xml.entry(name: name, originproject: project)
+      xml.entry(name: package.name, originproject: project)
     else
-      xml.entry(name: name)
+      if package.multibuild?
+        xml.entry(name: package.name)
+        package.multibuild_flavors.each do |flavor|
+          xml.entry(name: "#{package.name}:#{flavor}", originpackage: package.name)
+        end
+      else
+        xml.entry(name: package.name)
+      end
     end
   end
 end