Comment 11 for bug 1576353

AIUI the required openssh piece of this is now done:

openssh (1:7.6p1-4) unstable; urgency=medium

  * Move VCS to salsa.debian.org.
  * Add a preseeding-only openssh-server/password-authentication debconf
    template that can be used to disable password authentication (closes:
    #878945).

Remaining pieces to be done:
 - set up the d-i server preseed
 - set this correctly in the server live image (subiquity)
 - add openssh-server to the server seed.