In order to use a later version of bbl against an older
bbl environment/state directory, you will need to run
bbl plan before running bbl up.
bbl plan just writes the latest files and state directory structure.
bbl up is the applier. It will run terraform apply,
bosh create-env, and bosh update-cloud-config.
bbl5 up --lb-type cf --lb-cert cert --lb-key key --lb-domain domain.com
# some time passes
bbl6 plan --lb-type cf --lb-cert cert --lb-key key --lb-domain domain.com
bbl6 up
bbl6 destroy