Currently, IOErrors are just passed over due to the broken Exception
clause. A command like "bitbake X | <invalid command>" would break stdout
triggering a traceback. With these changes we print the exceptions, shut down
the server gracefully and exit which is a much nicer behaviour and is less
confusion to the user.
(Bitbake rev: 9544108f7b413038d871ce6ca88232de2f2434d9)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>