Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1136002
Description of problem:
`default_template_url` in the ConfigTemplatesController is returning an HTTPS url, which Anaconda will not like.

Version-Release number of selected component (if applicable):
6.0.4 Snap 7

How reproducible:
Always

Steps to Reproduce:
1. Setup host group provisioning
2. Deploy default PXE files
3. Look at /var/lib/tftpboot/pxelinux.cfg/default

Actual results:
The KS url is HTTPS

Expected results:
the KS url is HTTP

Additional info: