Re: [libvirt] [PATCHv3 4/6] conf: Refactor storing and usage of feature flags

Currently we were storing domain feature flags in a bit field as the they were either enabled or disabled. New features such as paravirtual spinlocks however can be tri-state as the default option may depend on hypervisor version. To allow storing tri-state feature state in the same place instead of having to declare dedicated variables for each feature this patch refactors the bit field to an array. --- Notes: Version 3: - no changes - second review requested (weakly ACKed)