bitbake: asyncrpc: Avoid file not found traceback in logs

If the server is quickly stopped, we see tracebacks in the locks
due to the file not existing. Hide these as they're not errors.

(Bitbake rev: a7e1a07e9ef7e6f6a1bcaf567d7916a8ee1ef087)

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

bitbake/lib/bb/asyncrpc/serv.py

@@ -211,7 +211,10 @@ class UnixStreamServer(StreamServer):
         self.server.close()
 
     def cleanup(self):
-        os.unlink(self.path)
+        try:
+            os.unlink(self.path)
+        except FileNotFoundError:
+            pass
 
 
 class WebsocketsServer(object):