use the correct backend protocol when defining the gpg proxy

Author: evgeni

spec/classes/foreman_proxy_content_spec.rb

@@ -210,7 +210,7 @@
         end
         it do
           is_expected.to contain_pulpcore__apache__fragment('gpg_key_proxy')
-            .with_https_content(%r{ProxyPass /katello/api/v2/repositories/ https://foo\.example\.com/katello/api/v2/repositories/})
+            .with_https_content(%r{ProxyPass /katello/api/v2/repositories/ h2://foo\.example\.com/katello/api/v2/repositories/})
         end
       end
 

templates/_pulp_gpg_proxy.erb

@@ -1,5 +1,5 @@
-  ProxyPass /katello/api/v2/repositories/ <%= @foreman_url %>/katello/api/v2/repositories/
+  ProxyPass /katello/api/v2/repositories/ <%= @proxy_foreman_url %>/katello/api/v2/repositories/
   <Location /katello/api/v2/repositories/>
-    ProxyPassReverse <%= @foreman_url %>/
+    ProxyPassReverse <%= @proxy_foreman_url %>/
   </Location>
   SSLProxyEngine On