Fixed #17785 -- Preferred column names in get_relations introspection

Thanks Thomas Güttler for the report and the initial patch, and
Tim Graham for the review.

tests/introspection/models.py

@@ -24,6 +24,7 @@ class Reporter(models.Model):
 class Article(models.Model):
     headline = models.CharField(max_length=100)
     pub_date = models.DateField()
+    body = models.TextField(default='')
     reporter = models.ForeignKey(Reporter)
     response_to = models.ForeignKey('self', null=True)