Bug 1687975

Description of problem:

Following the steps from https://access.redhat.com/documentation/en-us/red_hat_hyperconverged_infrastructure_for_virtualization/1.5/html-single/deploying_red_hat_hyperconverged_infrastructure_for_virtualization_on_a_single_node/

The setup fails during deploy with:

PLAY [gluster_servers] *********************************************************

TASK [Run a shell script] ******************************************************
failed: [10.18.49.229] (item=/usr/share/gdeploy/scripts/grafton-sanity-check.sh -d sdb -h 10.18.49.229) => {"item": "/usr/share/gdeploy/scripts/grafton-sanity-check.sh -d sdb -h 10.18.49.229", "msg": "Failed to connect to the host via ssh: Host key verification failed.", "unreachable": true}
fatal: [10.18.49.229]: UNREACHABLE! => {"changed": false, "msg": "All items completed", "results": [{"_ansible_ignore_errors": null, "_ansible_item_label": "/usr/share/gdeploy/scripts/grafton-sanity-check.sh -d sdb -h 10.18.49.229", "_ansible_item_result": true, "item": "/usr/share/gdeploy/scripts/grafton-sanity-check.sh -d sdb -h 10.18.49.229", "msg": "Failed to connect to the host via ssh: Host key verification failed.", "unreachable": true}]}
	to retry, use: --limit @/tmp/tmp7uJTOO/run-script.retry

PLAY RECAP *********************************************************************
10.18.49.229               : ok=0    changed=0    unreachable=1    failed=0   



Version-Release number of selected component (if applicable):

RHHI 1.5, RHVH 4.2.8

How reproducible:

Every time

Steps to Reproduce:
1. Install the RHVH host
2. Initiate a single host install from cockpit
3. Take defaults and Deploy

Actual results:

Fails to deploy

Expected results:

Should deploy

Additional info:

Ran this by Sahina and she feels that it requires passwordless ssh however there is NO mention of this requirement anywhere and nothing how to correctly set this up.