nginx: fix owner username of some files

bundles/nginx/items.py

@@ -23,7 +23,7 @@ directories = {
         },
     },
     '/var/log/nginx-timing': {
-        'owner': 'http',
+        'owner': 'www-data',
         'needs': {
             'pkg_apt:nginx',
         },
@@ -38,7 +38,7 @@ files = {
     '/etc/nginx/nginx.conf': {
         'content_type': 'mako',
         'context': {
-            'username': 'http',
+            'username': 'www-data',
             **node.metadata['nginx'],
         },
         'triggers': {