Remove reference to password for ssh usage

This reference to a temporary password being logged for the installer
user for SSH usage is obsolete.

live-build/ubuntu-server/includes.binary/overlay/etc/cloud/cloud.cfg

@@ -32,7 +32,7 @@ network:
                 name: "eth*"
             dhcp4: true
 
-final_message: "## template: jinja\nCloud-init v. {{version}} finished at {{timestamp}}. Datasource {{datasource}}.  Up {{uptime}} seconds\n\n\nWelcome to Ubuntu Server Installer!\n\nAbove you will find SSH host keys and a random password set for the `installer` user. You can use these credentials to ssh-in and complete the installation. If you provided SSH keys in the cloud-init datasource, they were also provisioned to the installer user.\n\nIf you have access to the graphical console, like TTY1 or HMC ASCII terminal you can complete the installation there too."
+final_message: "## template: jinja\nCloud-init v. {{version}} finished at {{timestamp}}. Datasource {{datasource}}.  Up {{uptime}} seconds\n\n\nWelcome to Ubuntu Server Installer!\n\nIf you provided SSH keys in the cloud-init datasource, they were also provisioned to the installer user.\n\nIf you have access to the graphical console, like TTY1 or HMC ASCII terminal you can complete the installation there too."
 
 # Example datasource config
 # datasource: