Fixed PostGIS test failures.

django/contrib/gis/db/backends/postgis/models.py

@@ -21,6 +21,7 @@ class GeometryColumns(models.Model):
     type = models.CharField(max_length=30)
 
     class Meta:
+        app_label = 'gis'
         db_table = 'geometry_columns'
         managed = False
 
@@ -58,6 +59,7 @@ class SpatialRefSys(models.Model, SpatialRefSysMixin):
     proj4text = models.CharField(max_length=2048)
 
     class Meta:
+        app_label = 'gis'
         db_table = 'spatial_ref_sys'
         managed = False