correctly update the local root_config reference. This should fix a
KeyError: 'porttree' exception that's been reported to be triggered
after --sync.
svn path=/main/trunk/; revision=11475
# Reload the whole config from scratch.
settings, trees, mtimedb = load_emerge_config(trees=trees)
portdb = trees[settings["ROOT"]]["porttree"].dbapi
+ root_config = trees[settings["ROOT"]]["root_config"]
mybestpv = portdb.xmatch("bestmatch-visible", "sys-apps/portage")
mypvs = portage.best(