First pass of cleanup of messages outputted to the user.

First pass of cleanup of messages outputted to the user.

OpenEmbedded outputs a lot of messages that the user is likely to never
care about.  We should only output something when it reflects upon their
recipe (i.e. unpacking their sources, applying their patches), or is quite
significant or unusual.

Signed-off-by: Chris Larson <clarson@mvista.com>