Description of problem:

When configuring sat6 with a manifest, it does not honour the configured cdn proxy

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. Install Katello/Sat6 and tell it to use a cdn proxy
2. Import a manifest
3. Click 'refresh manifest'
 

Actual results:
Katello does not go through the proxy

If the server cannot access the cdn directly, will get:
Error refreshing manifest. No route to host - connect(2)

Expected results:
Katello goes through the proxy

Additional info: