Permanently enable additional YUM repositories

[capote (Marko)]

how to roll back this testing for normal updates?

Updates for NethServer 7

Community updates on 17 February 2021 nethserver-subscription-3.6.8-1.ns7.noarch Subscription: Enable extra repositories inside the subscription - NethServer/dev#6427 nethserver-subscription-inventory-3.6.8-1.ns7.x86_64 Subscription: Enable extra repositories inside the subscription - NethServer/dev#6427 nethserver-subscription-ui-3.6.8-1.ns7.noarch Subscription: Enable extra repositories inside the subscription - NethServer/dev#6427