Log Message:
Update to 2.28

Upstream changes:
version 2.28 at 2018-09-17 09:19:09 +0000
-----------------------------------------

  Change: cf677362a133592236f3a438ba339ae0fa030c80
  Author: Chris 'BinGOs' Williams <chris@bingosnet.co.uk>
  Date : 2018-09-17 10:19:09 +0000

    Release engineering for 2.28

  Change: d712a41b23990ecbee9050b997532b8c6b4c6065
  Author: Damyan Ivanov <dmn@debian.org>
  Date : 2018-09-16 20:51:07 +0000

    add support for IPv6