cbuildbot_config: for sonic bots, set manifest_version=False

Until we switch all bots to use the official.xml manifest, we
can't be relying on the manifest handed out by the master (for
both paladins and canaries).

BUG=chromium:330225
TEST=unit test

Change-Id: I338168280bf78eceb3e0f7bb39a7e9e8e02044e6
Reviewed-on: https://chromium-review.googlesource.com/184384
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Gaurav Shah <gauravsh@chromium.org>
Commit-Queue: Gaurav Shah <gauravsh@chromium.org>
diff --git a/buildbot/cbuildbot_config.py b/buildbot/cbuildbot_config.py
index 048f4d0..7d3ff74 100755
--- a/buildbot/cbuildbot_config.py
+++ b/buildbot/cbuildbot_config.py
@@ -851,6 +851,10 @@
 # consistent. Currently sonic and other brillo builds differ too much.
 sonic = _config(
   manifest='official.xml',
+  # TODO(gauravsh): crbug.com/330225 - remove this when all canaries and
+  # paladins start using the official.xml manifest. See crbug.com/320913
+  # for the why (see comment #4).
+  manifest_version=False,
   boards=['sonic'],
   # Until these are configured and ready, disable them.
   images=['base', 'dev'],