For smaug-release:

https://cros-goldeneye.corp.google.com/chromeos/console/buildConfigBoard?name=smaug, just mark it as not active. 

For smaug-paladin: CL is prepared.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/chromite/+/8adb31f958974d726f771a609b0d2fd7f77e432e

commit 8adb31f958974d726f771a609b0d2fd7f77e432e
Author: xixuan <xixuan@chromium.org>
Date: Mon Jul 10 22:27:27 2017

build_config: remove smaug-paladin.

BUG= chromium:739949 
TEST=Ran unittest.

Change-Id: I118457bdacdc12d824bcddffbb3ffee7e5162828
Reviewed-on: https://chromium-review.googlesource.com/563528
Commit-Ready: Xixuan Wu <xixuan@chromium.org>
Tested-by: Xixuan Wu <xixuan@chromium.org>
Reviewed-by: Xixuan Wu <xixuan@chromium.org>

[modify] https://crrev.com/8adb31f958974d726f771a609b0d2fd7f77e432e/cbuildbot/config_dump.json
[modify] https://crrev.com/8adb31f958974d726f771a609b0d2fd7f77e432e/cbuildbot/waterfall_layout_dump.txt
[modify] https://crrev.com/8adb31f958974d726f771a609b0d2fd7f77e432e/cbuildbot/chromeos_config.py