(SERVER-2474) Remove `classes` and `parameters` keys
(SERVER-2474) Remove `classes` and `parameters` keys

Further investigation has revealed that we don't need to support node
classes and parameters being supplied along with the request. They will
always be fetched internally by Puppet instead. This commit removes
those keys from the request schema.

puppetlabs/puppet-server,puppetlabs/puppet-server,puppetlabs/puppetserver,puppetlabs/puppetserver,puppetlabs/puppetserver,puppetlabs/puppet-server,puppetlabs/puppetserver