This is to list the interface objects, supported filtering flags
are: active|inactive.

include/libvirt/libvirt.h.in: Declare enum virConnectListAllInterfaceFlags
                              and virConnectListAllInterfaces.
python/generator.py: Skip auto-generating
src/driver.h: (virDrvConnectListAllInterfaces)
src/libvirt.c: Implement the public API
src/libvirt_public.syms: Export the symbol to public