Py3 compat: xrange() -> range()

Yes, it's moderately slower, but for the uses here it's just fine

Change-Id: I23062a9b7ffdb85e0306664edf92759287d615f0
diff --git a/contrib/populate-fixture-data.py b/contrib/populate-fixture-data.py
index 93ac34f..e7e8d0b 100755
--- a/contrib/populate-fixture-data.py
+++ b/contrib/populate-fixture-data.py
@@ -160,7 +160,7 @@
 def generate_random_text():
   return " ".join([random.choice("lorem ipsum "
                                  "doleret delendam "
-                                 "\n esse".split(" ")) for _ in xrange(1, 100)])
+                                 "\n esse".split(" ")) for _ in range(1, 100)])
 
 
 def set_up():
@@ -299,7 +299,7 @@
   project_names = create_gerrit_projects(group_names)
 
   for idx, u in enumerate(gerrit_users):
-    for _ in xrange(random.randint(1, 5)):
+    for _ in range(random.randint(1, 5)):
       create_change(u, project_names[4 * idx / len(gerrit_users)])
 
 main()