[libvirt] [PATCH 0/5] Add virConnectListDefinedInterfaces/NumOfDefinedInterfaces

[Laine Stump]

This patch adds everything but the backend implementation of two APIs
that were requested during review of my patch to add virsh commands
that expose the virInterface* API. These count and list interfaces on
the host that are currently inactive (ie "down").
virConnectListInterfaces and virConnectNumOfInterfaces will list/count
*only* those interfaces that are currently active.

With these functions in place, I'll be able to add the "--inactive"
and "--all" flags to iface-list, as suggested by danpb.

Implementation of the backend of these two functions is waiting for
two things: 1) supporting code in libnetcf, and 2) implementation of
the rest of the backend driver functions for virInterface* (ready in
the wings and waiting to go).