(PUP-9648) Remove dead code

The base `Puppet::Indirector::Rest#handle_response` method was deleted in
ca36093 along with the code that used to call it. So the overridden
`handle_response` method is never called. Also the MAJOR_VERSION_JSON_DEFAULT
constant was also deleted.

Author: joshcooper

lib/puppet/indirector/report/rest.rb

@@ -20,19 +20,6 @@ def save(request)
     raise convert_to_http_error(e.response)
   end
 
-  # This is called by the superclass when not using our httpclient.
-  def handle_response(request, response)
-    if !response.success?
-      server_version = response[Puppet::Network::HEADER_PUPPET_VERSION]
-      if server_version &&
-         SemanticPuppet::Version.parse(server_version).major < Puppet::Indirector::REST::MAJOR_VERSION_JSON_DEFAULT &&
-         Puppet[:preferred_serialization_format] != 'pson'
-        format = Puppet[:preferred_serialization_format]
-        raise Puppet::Error.new(_("Server version %{version} does not accept reports in '%{format}', use `preferred_serialization_format=pson`") % {version: server_version, format: format})
-      end
-    end
-  end
-
   private
 
   def deserialize_save(content_type, body)