Adding a wrapper around pyflakes to filter out warnings which have been inspected and should be ignored.

- Legacy-Id: 249

test/pyflakes.exclude

@@ -0,0 +1,11 @@
+ietf/settings.py:144: 'from settings_local import *' used; unable to detect undefined names
+ietf/tests.py:8: redefinition of unused 'ietf' from line 7
+ietf/urls.py:1: 'handler500' imported but unused
+ietf/urls.py:1: 'handler404' imported but unused
+ietf/ipr/views.py:6: 'new' imported but unused
+ietf/contrib/__init__.py:1: 'form_decorator' imported but unused
+ietf/utils/__init__.py:1: 'flattenl' imported but unused
+ietf/utils/__init__.py:1: 'orl' imported but unused
+ietf/utils/__init__.py:2: 'log' imported but unused
+ietf/utils/__init__.py:3: 'FKAsOneToOne' imported but unused
+ietf/idtracker/templatetags/ietf_filters.py:8: redefinition of unused 'emailutils' from line 6

test/run-pyflakes

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+function filter() {
+python -c '
+import sys
+file = open(sys.argv[1])
+excludes = [line.strip() for line in file.readlines()]
+for line in sys.stdin:
+    if not line.strip() in excludes:
+	sys.stdout.write(line)
+' "$@"
+}
+
+pyflakes "$@" | filter "${0%/*}/pyflakes.exclude"