Server: xenial/yakkety named not installed

Server ISO tests at [1] the Xenial and Yakkety test cases do not appear to install bind9 or have the named service running after install. This causes the dns-server test cases to fail.

The install uses a preseed to install via: "tasksel tasksel/first multiselect Basic Ubuntu server, DNS server" This does not appear to be working. During the install of trusty for example you can see the apt-get command for the dns-server:

Aug 2 06:26:08 in-target: debconf (developer): starting /usr/bin/debconf-apt-progress --from 160 --to 800 --logstderr -- apt-get -q -y install dns-server^ minimal^ server^ standard^

However, here is output from Xenial, sans dns-server:

Aug 3 06:32:32 in-target: debconf (developer): starting /usr/bin/debconf-apt-progress --from 160 --to 800 --logstderr -- apt-get -q -y -o APT::Install-Recommends=true -o APT::Get::AutomaticRemove=true -o APT::Acquire::Retries=3 install server^ minimal^

[1] https://platform-qa-jenkins.ubuntu.com/view/server/