[autoroller] All commits in updates(), only roll interesting ones.

unittests/autoroll_test.py

 #!/usr/bin/env python
 # Copyright 2016 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 import copy
 import json
 import logging
 import os
 import subprocess
@@ skipping 73 matching lines @@
     a_c1 = self.commit_in_repo(repos['a'], message='c1')
 
     roll_result = self.run_roll(repos['b'])
     self.assertTrue(roll_result['success'])
     self.assertTrue(roll_result['trivial'])
 
     spec = copy.deepcopy(b_package_spec.spec_pb)
     spec.deps['a'].revision = a_c1['revision']
 
     expected_picked_roll = {
-        'commit_infos': {
-            'a': [
-                {
-                    'author_email': a_c1['author_email'],
-                    'message_lines': a_c1['message_lines'],
-                    'revision': a_c1['revision'],
-                },
-            ],
-        },
-        'spec': package_io.dump_obj(spec),
+      'commit_infos': {
+        'a': [
+          {
+            'author_email': a_c1['author_email'],
+            'message_lines': a_c1['message_lines'],
+            'revision': a_c1['revision'],
+          },
+        ],
+      },
+      'spec': package_io.dump_obj(spec),
     }
 
     self.assertEqual(expected_picked_roll['commit_infos'],
                      roll_result['picked_roll_details']['commit_infos'])
     self.assertEqual(expected_picked_roll['spec'],
                      roll_result['picked_roll_details']['spec'])
     self.assertEqual(
         0, roll_result['picked_roll_details']['recipes_simulation_test']['rc'])
 
   def test_nontrivial(self):
@@ skipping 403 matching lines @@
     self.assertEqual([], roll_result['roll_details'])
     self.assertGreater(len(roll_result['rejected_candidate_specs']), 0)
 
 
 if __name__ == '__main__':
   if '-v' in sys.argv:
     logging.basicConfig(
       level=logging.DEBUG,
       handler=repo_test_util.CapturableHandler())
   sys.exit(unittest.main())