DO NOT MERGE fixes #6715 - revert API v2 GET response to wrapped parameters using object node

Currently, the Foreman API v2 returns unwrapped params for GET and supports wrapped/unwrapped for POST/PUT but (nearly) all the functional tests are using wrapped params which means that the current documentation shows wrapped params. The goal is to be consistent, either wrapped or unwrapped, for tests, documentation, and api v2 usage by katello and hammer.  This PR represents the work to change Foreman to wrapped params.