daemonize: Flush stdio on exit

In spite of a comment suggesting otherwise, os._exit() does not flush
buffered output from file descriptors before exiting the process like
os.exit() does. This means that any un-flushed output is lost in the
daemon process, in particular the traceback from any thrown exceptions,
making debugging exceptions in the daemon quite difficult.

The solution is to flush stdout and stderr before exiting.

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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