bitbake: server/process: Use a pipe for quit events instead of Event()

Its not possible to notice the change of status of an Event() in
the select call we sleep in. It would be possible in python 3.3 but
for now use a pipe instead. This removes small latency when bitbake
commands finish since the system doesn't sit in the select call.

(Debugging these kind of issues is apparent by setting a long sleep
for the select call)

(Bitbake rev: def28239b0f0d5f1cf13214b263114a5328538b7)

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

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