Remove all DAO get service calls, replaced with reference to new service object in context.

app/v2/template/post_template.py

@@ -1,9 +1,7 @@
 from flask import jsonify, request
-from jsonschema.exceptions import ValidationError
 
-from app import api_user
+from app import authenticated_service
 from app.dao import templates_dao
-from app.models import SMS_TYPE
 from app.schema_validation import validate
 from app.utils import get_template_instance
 from app.v2.errors import BadRequestError
@@ -22,7 +20,7 @@ def post_template_preview(template_id):
     data = validate(_data, post_template_preview_request)
 
     template = templates_dao.dao_get_template_by_id_and_service_id(
-        template_id, api_user.service_id)
+        template_id, authenticated_service.id)
 
     template_object = get_template_instance(
         template.__dict__, values=data.get('personalisation'))