paygen: Remove au-generator.zip

We now do paygen in chroot. There is no need for au-generator anymore. Remove
any uses cases of it.

BUG=chromium:808495
TEST=tryjob payload

Change-Id: I5d01cfb1273ddbe80fc7011a5769c44961497564
Reviewed-on: https://chromium-review.googlesource.com/1085687
Commit-Ready: Amin Hassani <ahassani@chromium.org>
Tested-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Don Garrett <dgarrett@chromium.org>
diff --git a/scripts/pushimage_unittest.py b/scripts/pushimage_unittest.py
index 10f1dcb..cf8a618 100644
--- a/scripts/pushimage_unittest.py
+++ b/scripts/pushimage_unittest.py
@@ -286,7 +286,7 @@
     with mock.patch.object(gs.GSContext, 'Exists', return_value=True):
       urls = pushimage.PushImage('/src', 'test.board', 'R34-5126.0.0',
                                  sign_types=['recovery'])
-    self.assertEqual(self.gs_mock.call_count, 26)
+    self.assertEqual(self.gs_mock.call_count, 24)
     self.assertTrue(self.mark_mock.called)
     self.assertEqual(urls, EXPECTED)
 
@@ -304,7 +304,7 @@
     with mock.patch.object(gs.GSContext, 'Exists', return_value=True):
       urls = pushimage.PushImage('/src', 'test.board', 'R34-5126.0.0',
                                  sign_types=['base'])
-    self.assertEqual(self.gs_mock.call_count, 28)
+    self.assertEqual(self.gs_mock.call_count, 26)
     self.assertTrue(self.mark_mock.called)
     self.assertEqual(urls, EXPECTED)
 
@@ -312,7 +312,7 @@
     """Verify nothing is signed when we request an unavailable type"""
     urls = pushimage.PushImage('/src', 'test.board', 'R34-5126.0.0',
                                sign_types=['nononononono'])
-    self.assertEqual(self.gs_mock.call_count, 24)
+    self.assertEqual(self.gs_mock.call_count, 22)
     self.assertFalse(self.mark_mock.called)
     self.assertEqual(urls, {})