bitbake: cooker/process: Fix signal handling lockups

If a parser process is terminated while holding a write lock, then it
will lead to a deadlock (see
https://docs.python.org/3/library/multiprocessing.html#multiprocessing.Process.terminate).

With SIGTERM, we don't want to terminate holding the lock. We also don't
want a SIGINT to cause a partial write to the event stream.

I tried using signal masks to avoid this but it doesn't work, see
https://bugs.python.org/issue47139

Instead, add a signal handler and catch the calls around the critical section.
We also need a thread lock to ensure other threads in the same process don't
handle the signal until all the threads are not in the lock.

(Bitbake rev: a40efaa5556a188dfe46c8d060adde37dc400dcd)

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

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