Add leon configuration to cbuildbot_config.py
Add leon configuration to cbuildbot_config.py

Note that hardware is not available in the lab yet, so we don't do
hwtest or vmtest.

TEST=buildbot/cbuildbot_config_unittest.py
BUG=chromium:279096

Change-Id: I4d4e19253aea73146305ffe1f7879fb206f97019
Reviewed-on: https://chromium-review.googlesource.com/169013
Reviewed-by: Bernie Thompson <88a16a105b67ec86732da208bff06a7d4d211801@chromium.org>
Reviewed-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>
Tested-by: Yung Leem <2531d37f43ca736e2a026f79936803b871cc5639@chromium.org>
Reviewed-by: Mike Stipicevic <ccb34296aef17401001f8797fd231ebed0251c8d@chromium.org>
Commit-Queue: Mike Stipicevic <ccb34296aef17401001f8797fd231ebed0251c8d@chromium.org>
Commit-Queue: Yung Leem <2531d37f43ca736e2a026f79936803b871cc5639@chromium.org>

chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite