daemonize: Various fixes

Currently if this code is used with something like oeqa's xml logging
it fails as sys.stdout is an io stream. Add in try/except to handle
this case.

Add a waitpid() call to remove a zombie whilst forking.

Also, append to the logfile, don't overwrite it (otherwise
debugging can be a real pain when the server is restarting for
unknown reasons).

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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