pep8: Ignore 'module level import not at top of file' error

Reviewed-by: Philip Withnall <philip.withnall@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D923

.arclint

@@ -2,6 +2,7 @@
   "linters": {
     "pep8-default": {
       "type": "pep8",
+      "flags": ["--ignore=E402"],
       "include": "(\\.py$)"
     }
   }