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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>