Fix basic_users not modifying default nfs-shared home correctly #590
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Fixes an issue where basic_users doesn't always modify /home correctly (i.e. create user home dirs and create/accept ssh keys) for the default NFS configuration, because the control node does not mount /home and might end up being the first host in the play and therefore running these tasks.
This has never been noticed because
a) this aspect of the demo_user isn't tested in CI
b) the caas environment does mount /home on the control node (to provide access to that to allow modification of packages etc across the cluster)
Also changes the default type of the created in-cluster ssh key from rsa to ed25519.