bitbake: compat, event: use OrderedDict from py2.7 for the event handlers

This ensures that our event handlers get run in registration order, making the
behavior more deterministic. I pulled in the python2.7 OrderedDict to avoid
essentially reimplementing a version of it ourselves, figuring we can drop it
when we bump our required python version next.

(Bitbake rev: 44aa0b0537d3fbd1272015e7677948f84d8c0607)

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/event.py

@@ -32,6 +32,7 @@ import logging
 import atexit
 import traceback
 import bb.utils
+import bb.compat
 
 # This is the pid for which we should generate the event. This is set when
 # the runqueue forks off.
@@ -53,7 +54,7 @@ Registered        = 10
 AlreadyRegistered = 14
 
 # Internal
-_handlers = {}
+_handlers = bb.compat.OrderedDict()
 _ui_handlers = {}
 _ui_handler_seq = 0