Release 1.28.0

This release includes quite a few changes including those to how we
autoname branches based on bug or blueprint. Git review won't do that
anymore.

Many other changes have to do with improvements to testing.
-----BEGIN PGP SIGNATURE-----

iQFLBAABCAA1FiEET8qJ4hPH7TKLNiKbDvuUPp4MATwFAlyrqXYXHGNsYXJrLmJv
eWxhbkBnbWFpbC5jb20ACgkQDvuUPp4MATyqbQf+IL9YyFAwqCyBM8WqPYZExnk+
Q3uJf1YgRfsWPszrwVuHWk+IxOlvtE4fZsfKnI/DrKRiYriWfv6r5imBWBlnMTl5
+tqX214tWPNI57qDD4wSqy7Hv2+e2bUYoJWuwzDGif9XFTvcAy2OFDzKy9GCTcdi
LujPz8I9/r7oAC+bNl0c2owQXM7Sg6+ocSTu/P3TXDfGTDYi7zQUWHcTBMsZpgqu
gRwSCrUgLkBoWK6fG8aYmC2OGYIrXqi1qIreqy3cszJxTDh7//p3cPcqiZ1taXkQ
pD5iNR1HYuX6W7ixICEoXlPc9O5qWCYJ1yEDUy/lIOsN6dI5mi5kUhjbyULA6A==
=Hy23
-----END PGP SIGNATURE-----