RHEL 7.8: Getting already attached pools not working

[mungo312]

After Updating to RHEL7.8 the module can not get the already attached pools.

After some investigation I think the problem is that the /usr/sbin/subscription-manager list --consumed command does not produce a line System Type, it is now called Entitlement Type.
Because of this the current subscription is never added to the array of subscriptions.

If nobody else is faster I will try to provide a badly tested pull request.

[waveclaw]

Duplicates #99 which has an untested patch to check