If you send this forked process a SIGTERM, it will execute all of the
parent's exit code leading to two sets of console/exit output which is
extremely confusing. Wrap the code in a try/finally to ensure we always
call os._exit() to avoid this.
I spent far too long trying to work out the crazy console output from this.
(From OE-Core rev: 652e40bfae24b8e23bbf7a7f35d900d2ab8d0f92)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>