Fix plans object in services response example
Fix plans object in services response example

Move max_storage_tb to metadata section since the plans object only has fields
for id, name, description, metadata, free, and bindable currently.

Also, set free to false since the default is true and the metadata
implies a cost is present.

duglin/servicebroker,servicebroker/servicebroker,servicebroker/servicebroker,servicebroker/servicebroker,openservicebrokerapi/servicebroker