Add external_authentication_uid to actors endpoint for querying

lib/chef_zero/endpoints/actors_endpoint.rb

@@ -21,6 +21,19 @@ def get(request)
           response[2] = to_json(new_results)
         end
 
+        if request.query_params['external_authentication_uid']
+          results = parse_json(response[2])
+          new_results = {}
+          results.each do |name, url|
+            record = get_data(request, request.rest_path + [ name ], :nil)
+            if record
+              record = parse_json(record)
+              new_results[name] = url if record['external_authentication_uid'] == request.query_params['external_authentication_uid']
+            end
+          end
+          response[2] = to_json(new_results)
+        end
+
         if request.query_params['verbose']
           results = parse_json(response[2])
           results.each do |name, url|