refactor: have ci-lite use same structure as other envs for lb_certs
refactor: have ci-lite use same structure as other envs for lb_certs

* this allows us to re-use the add-lb-ca-cert.yml file instead of having
a custom ci-lite ca_certs file

[#170059380](https://www.pivotaltracker.com/story/show/170059380)

Co-authored-by: Clay Kauzlaric <b161dd152ba17987305414195d30c2af856d229f@pivotal.io>

cloudfoundry-incubator/cf-routing-release,cloudfoundry-incubator/cf-routing-release,cloudfoundry-incubator/cf-routing-release