interface: let netcf pre-filter for active vs. inactive
interface: let netcf pre-filter for active vs. inactive

If a system has a large number of active or active interfaces, it can
be a big waste of time to retrieve and qualify all interfaces if the
caller only wanted one subset. Since netcf has a simple flag for this,
translate the libvirt flag into a netcf flag and let netcf pre-filter.

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