[Debian-ha-maintainers] Bug#850308: Bug#850308: drbd-doc: Move from asciidoc to asciidoc-base as build dependency

[Christoph Berg]

Re: Joseph Herlant 2017-01-05 <CAPQicOxv+3T5tYPPWowSPenNRJ49jak1EV6EvwErL4UCRVQ=Rw at mail.gmail.com>
> In addition to that, the xmlto package has been added to the
> recommends of the asciidoc-base package in #692274, so it might not be
> mandatory to have it in the buid-depends if you currently have it.

Assuming Recommends to be automatically installed as Build-Depends is
wrong.

Christoph