Spring: Add Spring Builders
Spring: Add Spring Builders

Add in spring builder configurations.

BUG=None.
TEST=Manual, verify cbuildbot_config_unittest.py passes, and trybot for
spring-paladin and spring-release completes successfully.

Change-Id: I5cf0efadab4bedfffae48458ad581e17eea500d5
Reviewed-on: https://gerrit.chromium.org/gerrit/39139
Reviewed-by: Bernie Thompson <88a16a105b67ec86732da208bff06a7d4d211801@chromium.org>
Tested-by: Bernie Thompson <88a16a105b67ec86732da208bff06a7d4d211801@chromium.org>
Reviewed-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>
Reviewed-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>
Commit-Ready: Bernie Thompson <88a16a105b67ec86732da208bff06a7d4d211801@chromium.org>

chadversary/chromiumos.chromite,zhang0137/chromite,zhang0137/chromite,coreos/chromite,bpsinc-native/src_third_party_chromite,zhang0137/chromite,chadversary/chromiumos.chromite,coreos/chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,coreos/chromite