based interfaces. Note: all other interface types work the same as before,
and no names are hardcoded.
When a if_spppsubr.c based interface is marked IFF_UP, but has not yet
reached phase NETWORK (i.e. it didn't connect yet or authentication has not
yet completed) do not call the ip-up script for it on the initial pass
over all IFF_UP interfaces.
This fixes a race condition on startup when ip-up/ip-down are statefull
and need to be called pairwise (for example if ip-up adds and ip-down
removes a default route).