Nic::Bootable should be removed
The Nic::Bootable model should have been removed entirely in #10988, but instead only the deprecation warning (when using the class) was removed. The model should be deleted.
Fixes #12245 - Remove Nic::Bootable
On c1755e070ee10ee026e0b3996378368369c4ca83 I removed the deprecation of
using Nic::Bootable. However the model could still be used, now without
Remove the model and other instances where it's called, and substitute
it by Nic::Managed with provision set to true.