Update host template for different user scenario

[FitiaHarena]

Otherwise getting undefined for ansible_ssh_user at:

TASK [artefactual.atom-replication : create tarball of the ES repo] ************

FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'ansible_ssh_user' is undefined\n\nThe error appears to be in '/usr/share/nginx/atom-replication/roles/artefactual.atom-replication/tasks/es-backup.yml': line 27, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: \"create tarball of the ES repo\"\n  ^ here\n"}