bitbake: bitbake: Set process names to be meaninful

This means that when you view the process tree, the processes
have meaningful names, aiding debugging:

$ pstree -p 30021
bash(30021)───KnottyUI(115579)───Cooker(115590)─┬─PRServ(115592)───{PRServ Handler}(115593)
                                                ├─Worker(115630)───bash:sleep(115631)───run.do_sleep.11(115633)───sleep(115634)
                                                └─{ProcessEQueue}(115591)

$ pstree -p 30021
bash(30021)───KnottyUI(117319)───Cooker(117330)─┬─Cooker(117335)
                                                ├─PRServ(117332)───{PRServ Handler}(117333)
                                                ├─Parser-1:2(117336)
                                                └─{ProcessEQueue}(117331)

Applies to parse threads, PR Server, cooker, the workers and execution
threads, working within the 16 character limit as best we can.

Needed to tweak the bitbake-worker magic values to tell the
workers apart.

(Bitbake rev: 539726a3b2202249a3f148d99e08909cb61902a5)

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

bitbake/lib/bb/server/process.py

@@ -106,6 +106,7 @@ class ProcessServer(Process, BaseImplServer):
         # the UI and communicated to us
         self.quitin.close()
         signal.signal(signal.SIGINT, signal.SIG_IGN)
+        bb.utils.set_process_name("Cooker")
         while not self.quit:
             try:
                 if self.command_channel.poll():
@@ -212,6 +213,7 @@ class ProcessEventQueue(multiprocessing.queues.Queue):
     def __init__(self, maxsize):
         multiprocessing.queues.Queue.__init__(self, maxsize)
         self.exit = False
+        bb.utils.set_process_name("ProcessEQueue")
 
     def setexit(self):
         self.exit = True