Add function to delete DNS records

Adds a function to delete DNS records. To be consumed by other packages
that use the create functions here.

bootstrap_cfn/r53.py

@@ -45,3 +45,12 @@ def get_record(self, zone, zone_id, record, record_type):
                     rr.resource_records[0] = rr.resource_records[0][1:-1]
                 return rr.resource_records[0]
         return None
+
+    def delete_dns_record(self, zone, record, record_type):
+        '''
+        Returns True if delete successful or raises an exception if not
+        '''
+        changes = boto.route53.record.ResourceRecordSets(self.conn_r53, zone)
+        changes.add_change("DELETE", record, record_type)
+        changes.commit()
+        return True

tests/test_r53.py

@@ -17,6 +17,15 @@ def setUp(self):
         self.env.application = 'unittest-app'
         self.env.config = os.path.join(self.work_dir, 'test_config.yaml')
 
+    def test_delete_dns_record(self):
+        r53_mock = mock.Mock()
+        r53_connect_result = mock.Mock(name='cf_connect')
+        r53_mock.return_value = r53_connect_result
+        boto.route53.connect_to_region = r53_mock
+        r = r53.R53(self.env.aws_profile)
+        x = r.delete_dns_record('blah/blah', 'x.y', 'A')
+        self.assertTrue(x)
+
     def test_update_dns_record(self):
         r53_mock = mock.Mock()
         r53_connect_result = mock.Mock(name='cf_connect')