Kill the uncaught exception handler

Kill the uncaught exception handler

We now wrap the main() in a try/except, ensuring that both the main portion of
bin/bitbake and the UI raising an exception will be shown to the user.  For
the server and workers, we can ensure in the server itself that exceptions are
handled correctly.

(Bitbake rev: 240d4a7ae80a6636c302ae84266ddfed7a7fcedd)

Signed-off-by: Chris Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>