significantly overhaul output helpers

There are a few major points we want to hit here:
 - have all output from libsandbox go through portage helpers when we are
   in the portage environment so that output is properly logged
 - convert SB_E{info,warn,error} to sb_e{info,warn,error} to match style
   of other functions and cut down on confusion
 - move all abort/output helpers to libsbutil so it can be used in all
   source trees and not just by libsandbox
 - migrate all abort points to the centralized sb_ebort helper

Unfortunately, it's not terribly easy to untangle these into separate
patches, but hopefully this shouldn't be too messy as much of it is
mechanical: move funcs between files, and change the name of funcs
that get called.

URL: http://bugs.gentoo.org/278761
Reported-by: Mounir Lamouri <volkmar@gentoo.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

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