cq.cfg: use luci builders
cq.cfg: use luci builders

do not use buildbot builder
update luci bucket name

R=estaab@chromium.org, dnj@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2171953004

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go