[Framework] Utils - Collins client config
[Framework] Utils - Collins client config

* Cfg is now using anything the user will put in Genesis config under ':collins' key
* Use a symbol for Collins key like everything else in Genesis config
(Even in testenv it is that way: https://github.com/tumblr/genesis/blob/master/testenv/bootbox/puppet/modules/genesis/templates/config.yaml.erb#L23-L24)

tumblr/genesis,tumblr/genesis,tumblr/genesis