Use lazy evaluation for exports_config
Use lazy evaluation for exports_config

Avoid evaluating this at compilation with the default value, which was
`true` when this commit was originally written, and is now an empty hash

evertrue/zookeeper-cookbook,SimpleFinance/chef-zookeeper,SimpleFinance/chef-zookeeper,criteo-forks/chef-zookeeper,SimpleFinance/chef-zookeeper,evertrue/zookeeper-cookbook,evertrue/zookeeper-cookbook