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Spawn a process using Twisted reactor.
Return a deferred which will be called with process stdout, stderr and exit
code.
@param wait_pipes: if set to False, don't wait for stdin/stdout pipes to
close when process ends.
@param line_received: an optional callback called with every line of
output from the process as parameter.
@note: compared to reactor.spawnProcess, this version does NOT require the
executable name as first element of args.
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This behaves exactly like the original method, but in case the
process has ended already and sent us a SIGCHLD, it doesn't wait
for the stdin/stdout pipes to close, because the child process
itself might have passed them to its own child processes.
@note: Twisted 8.2 now has a processExited hook that could
be used in place of this workaround.
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