Merge ~paelzer/germinate:improve-reproducibility-by-ordering into germinate:master

[Christian Ehrhardt ]

[Colin Watson (cjwatson)]

review: Approve

diff --git a/germinate/germinator.py b/germinate/germinator.py
index 11ad556..01ecd24 100644
--- a/germinate/germinator.py
+++ b/germinate/germinator.py
@@ -1709,7 +1709,7 @@ class Germinator(object):
 
         # For each source, add any binaries that match the include/exclude
         # patterns.
-        for src in rescue_srcs:
+        for src in sorted(rescue_srcs):
             rescue = [p for p in self._sources[src]["Binaries"]
                       if p in self._packages]
             included = set()
@@ -1719,7 +1719,8 @@ class Germinator(object):
             if rescue_seedname in seed._excludes:
                 for exclude in seed._excludes[rescue_seedname]:
                     included -= set(self._filter_packages(rescue, exclude))
-            for pkg in included:
+
+            for pkg in sorted(included):
                 if pkg in output._all:
                     continue
                 for lesserseed in self._strictly_outer_seeds(seed):