Merge branch 'wip-entitlements-enable-repos' into 'master'

Merge branch 'wip-entitlements-enable-repos' into 'master'

enable RHEL repositories from CDN

Note that the testnode role is creating the following .repo files (that point to apt-mirror). With the Red Hat CDN, these are now redundant:

* `rhel7-extras.repo`
* `rhel7-optional.repo`
* `rhel7.repo`

These are harmless since they simply contain older versions of packages and yum will prefer the CDN repositories since the packages there are newer. Eventually we should figure out a way to remove these, though.