savecache: stop saving nettree
savecache: stop saving nettree

Netifrc is no longer part of OpenRC, so we shouldn't save its dep tree
as part of savecache.

This should have been removed when netifrc was split out. also, it
might be related to the following bug.

X-Gentoo-Bug: 563720
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=563720

williamh/openrc,dwfreed/openrc,dwfreed/openrc,williamh/openrc,OpenRC/openrc,dwfreed/openrc,OpenRC/openrc,williamh/openrc,OpenRC/openrc