Make the bulk endpoint templates work in API browser

Various fixes

- Don't skip checking resource RBAC permissions for admins
Necessary to handle bad input, e.g. providing a
unified_job_template id that doesn't exit

- In awxkit, only "walk" if we get 'url' in the result

- Bulk host create should return url pointing to inventory,
not inventory/hosts

dont do org check for superuser

awx/api/views/bulk.py

@@ -6,6 +6,7 @@ from rest_framework.reverse import reverse
 from rest_framework import status
 from rest_framework.response import Response
 
+from awx.main.models import UnifiedJob, Host
 from awx.api.generics import (
     GenericAPIView,
     APIView,