Applied ignore_warnings to Django tests

tests/string_lookup/models.py

@@ -1,6 +1,5 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
-import warnings
 
 from django.db import models
 from django.utils.encoding import python_2_unicode_compatible
@@ -55,9 +54,7 @@ class Base(models.Model):
 class Article(models.Model):
     name = models.CharField(max_length=50)
     text = models.TextField()
-    with warnings.catch_warnings(record=True) as w:
-        warnings.simplefilter("always")
-        submitted_from = models.IPAddressField(blank=True, null=True)
+    submitted_from = models.GenericIPAddressField(blank=True, null=True)
 
     def __str__(self):
         return "Article %s" % self.name