Patch merged into coreboot/master: cbfstool: update warning on cbfstool extract

the following patch was just integrated into master:
commit 011b0b3af8426d4e9372eef86f16620038f04a1c
Author: Patrick Georgi 
Date:   Wed Aug 26 12:16:54 2015 +0200

cbfstool: update warning on cbfstool extract

We have tons of file types now that can be safely extracted.
    It's pretty much only stages and payloads that aren't.

Change-Id: Ibf58a2c721f863d654537850c6f93d68a8a5bbeb
    Signed-off-by: Patrick Georgi 
    Reviewed-on: http://review.coreboot.org/11360
    Tested-by: build bot (Jenkins)
    Reviewed-by: Aaron Durbin

See http://review.coreboot.org/11360 for details.

-gerrit