The ssh config file is /.ssh/config (not ssh_config)
We are accepting the ed25519 key, not the ecdsa key, so fix that in
the known_hosts stanza.
Change-Id: If3a42a7872f5d5e7a2bf9c3b5184fb14d43e6a1a
This introduces two new roles for managing the backup-server and hosts
that we wish to back up.
Firstly the "backup" role runs on hosts we wish to backup. This
generates and configures a separate ssh key for running bup and
installs the appropriate cron job to run the backup daily.
The "backup-server" job runs on the backup server (or, indeed
servers). It creates users for each backup host, accepts the remote
keys mentioned above and initalises bup. It is then ready to receive
backups from the remote hosts.
This eliminates a fairly long-standing requirement for manual setup of
the backup server users and keys; this section is removed from the
documentation.
testinfra coverage is added.
Change-Id: I9bf74df351e056791ed817180436617048224d2c
