Rather than only handling sys.stdout, also support any arbitrary file object,
and enable color for the formatter if that file is a tty.
(Bitbake rev: c46db4be4cc4dc53376ed3f574b2f1c868730f2a)
Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>