[PATCH] data: Make expandKeys deterministic

[Richard Purdie <richard.purdie@linuxfoundation.org>]

At least in theory, the order the keys are expanded in can make
a difference, particularly if there is key overlap.

We also want to ensure that any underlying base key is processed
before any overridden version of that variable (FOO before FOO_x)
which helps the update_data removal code I've been testing.

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

diff --git a/bitbake/lib/bb/data.py b/bitbake/lib/bb/data.py
index 439c365..84f5355 100644
--- a/bitbake/lib/bb/data.py
+++ b/bitbake/lib/bb/data.py
@@ -159,7 +159,7 @@ def expandKeys(alterdata, readdata = None):
 
     # These two for loops are split for performance to maximise the
     # usefulness of the expand cache
-    for key in todolist:
+    for key in sorted(todolist):
         ekey = todolist[key]
         newval = alterdata.getVar(ekey, 0)
         if newval is not None:
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