bitbake: utils: Add signal_on_parent_exit() function

Add a new bb.utils.signal_on_parent_exit() function so that a process
can register to recieve a signal when the parent dies. There is no
POSIX standard for this and the implementation is Linux specific.
Alternatives would be having an open pipe or polling os.getppid()
for changes but this seems more effective and less invasive to most
of bitbake's code structure.

We need to be able to determine when parents die to ensure child
processes stop running in a variety of circumstances to avoid
locks being held and ensure clean shutdown.

Roughly based on https://gist.github.com/evansd/2346614

(Bitbake rev: 34974f5e30e9b09c016481e4c81c156a5f379784)

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

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