Pass IP whitelist to lockclb from playbook.
Using yaml.safe_load so only standard YAML tags are parsed.
Merge pull request #852 from ycombinator/kill-ip-access-yml

Pass IP whitelist to lockclb from playbook.
Specify docroot and backendroot since these are no longer in vars.yml.
Merge pull request #855 from ycombinator/gh-854

Specify docroot and backendroot since these are no longer in vars.yml.
Fixes Docs issue reported by customer.
Merge pull request #857 from rdodev/pkgcloud-compute-fix

Fixes Docs issue reported by customer.