Update Multi-Server SSH keys

The communication between the nodes, including the exchange of data, uses SSH and requires SSH keys to be set up for automatic, non-interactive logins. Therefore, it is necessary that the keys are always up-to-date and synchronised. In order to update the keys, this command must ebe executed on all nodes:

# su - zextras -c "/opt/zextras/bin/zmupdateauthkeys"