pick first PTR value instead of erroring out

tests/test_octodns_record.py

@@ -2755,16 +2755,6 @@ class TestRecordValidation(TestCase):
         self.assertEquals(['PTR value "foo.bar" missing trailing .'],
                           ctx.exception.reasons)
 
-        # multi-value requesting single-value
-        with self.assertRaises(AttributeError) as ctx:
-            Record.new(self.zone, '', {
-                'type': 'PTR',
-                'ttl': 600,
-                'values': ['foo.com.', 'bar.net.'],
-            }).value
-        self.assertEquals("Multi-value PTR record has no attribute 'value'",
-                          text_type(ctx.exception))
-
     def test_SSHFP(self):
         # doesn't blow up
         Record.new(self.zone, '', {