Revert "cbuildbot: Use CQ logic for patch resolution/applying."

This reverts commit 11272651bfb62a63320d6bc39e05f590c84bc86e and
5a0de704cd175886e1e98d099c3d016bd58a9f4d .

3 Bugs in total have surfaced; one spotted shortly after, 2 others
via remote; 2/3 are fixed, but production isn't the place to sort
it out.

BUG=None
TEST=None

Change-Id: I372825097b536ebdf305be200c6a1057a1142a29
Reviewed-on: https://gerrit.chromium.org/gerrit/26995
Reviewed-by: Brian Harring <ferringb@chromium.org>
Tested-by: Brian Harring <ferringb@chromium.org>
diff --git a/scripts/cbuildbot.py b/scripts/cbuildbot.py
index d1ad56a..6e1fd03 100644
--- a/scripts/cbuildbot.py
+++ b/scripts/cbuildbot.py
@@ -11,6 +11,7 @@
 """
 
 import distutils.version
+import errno
 import glob
 import logging
 import multiprocessing
@@ -162,7 +163,7 @@
     self.archive_stages = {}
     self.archive_urls = {}
     self.release_tag = None
-    self.patch_pool = trybot_patch_pool.TrybotPatchPool()
+    self.patch_pool = trybot_patch_pool.GetEmptyPool()
 
     bs.BuilderStage.SetManifestBranch(self.options.branch)