FAI 5.6

[Thomas Lange]

The new FAI release 5.6 includes following important change:

  * When installing the package fai-server, use the repository
    from fai-project.org by default for building the nfsroot
  * fai-make-nfsroot: support ED25519 instead of DSA keys

New packages are available in Debian unstable and in the repository of
the FAI project. This version is still working on Debian stretch.
-- 
regards Thomas