Hello Gianluca,
thanks for opening the bug. I have also reported my test scenario below.

(One thing more in my case, the standalone Manager needs to be installed on EL8 
and not like documents says on EL7.
With EL7 load is gives an error that Engine for EL7 is not avaiable. Document 
needs to be updated.)


---
The same error occurs when trying to add a node to a standalone Engine Manager.

Steps to Reproduce:
1. install a standalone Engine Manager on EL8 step by step with this 
documentation
https://www.ovirt.org/documentation/installing_ovirt_as_a_standalone_manager_with_local_databases/#Installing_the_Red_Hat_Virtualization_Manager_SM_localDB_deploy
2. install a node using ovirt-node-ng-installer-4.4.1-2020071311.el8.iso
3. try to add the node inside the Engine Manager

Log output:
2020-07-21 10:14:17 CEST - included: 
/usr/share/ovirt-engine/ansible-runner-service-project/project/roles/ovirt-host-deploy-vdsm/tasks/packages.yml
 for ovirtnode1.example.net
2020-07-21 10:14:17 CEST - included: 
/usr/share/ovirt-engine/ansible-runner-service-project/project/roles/ovirt-host-deploy-vdsm/tasks/vdsmid.yml
 for ovirtnode1.example.net
2020-07-21 10:14:17 CEST - included: 
/usr/share/ovirt-engine/ansible-runner-service-project/project/roles/ovirt-host-deploy-vdsm/tasks/pki.yml
 for ovirtnode1.example.net
2020-07-21 10:14:17 CEST - included: 
/usr/share/ovirt-engine/ansible-runner-service-project/project/roles/ovirt-host-deploy-vdsm/tasks/restart_services.yml
 for ovirtnode1.example.net
2020-07-21 10:14:17 CEST - TASK [ovirt-host-deploy-vdsm : Install ovirt-host 
package] *********************
2020-07-21 10:14:17 CEST -
2020-07-21 10:14:17 CEST - fatal: [ovirtnode1.example.net]: FAILED! => 
{"changed": false, "module_stderr": "/bin/sh: /usr/bin/python2: No such file or 
directory\n", "module_stdout": "", "msg": "The module failed to execute 
correctly, you probably need to set the interpreter.\nSee stdout/stderr for the 
exact error", "rc": 127}
2020-07-21 10:14:17 CEST - {
  "status" : "OK",
  "msg" : "",
  "data" : {
    "uuid" : "bfb59a41-6672-4115-ba93-1755556b3d11",
    "counter" : 61,
    "stdout" : "fatal: [ovirtnode1.example.net]: FAILED! => {\"changed\": 
false, \"module_stderr\": \"/bin/sh: /usr/bin/python2: No such file or 
directory\\n\", \"module_stdout\": \"\", \"msg\": \"The module failed to 
execute correctly, you probably need to set the interpreter.\\nSee 
stdout/stderr for the exact error\", \"rc\": 127}",
    "start_line" : 54,
    "end_line" : 55,
    "runner_ident" : "230c108e-cb2a-11ea-97da-00155d120809",
    "event" : "runner_on_failed",
    "pid" : 28965,
    "created" : "2020-07-21T08:14:16.528490",
    "parent_uuid" : "00155d12-0809-c845-9450-0000000001a1",
    "event_data" : {
      "playbook" : "ovirt-host-deploy.yml",
      "playbook_uuid" : "3a66c11c-02f9-492a-937d-21f1386e492d",
      "play" : "all",
      "play_uuid" : "00155d12-0809-c845-9450-000000000006",
      "play_pattern" : "all",
      "task" : "Install ovirt-host package",
      "task_uuid" : "00155d12-0809-c845-9450-0000000001a1",
      "task_action" : "yum",
      "task_args" : "",
      "task_path" : 
"/usr/share/ovirt-engine/ansible-runner-service-project/project/roles/ovirt-host-deploy-vdsm/tasks/packages.yml:2",
      "role" : "ovirt-host-deploy-vdsm",
      "host" : "ovirtnode1.example.net",
      "remote_addr" : "ovirtnode1.example.net",
      "res" : {
        "module_stdout" : "",
        "module_stderr" : "/bin/sh: /usr/bin/python2: No such file or 
directory\n",
        "msg" : "The module failed to execute correctly, you probably need to 
set the interpreter.\nSee stdout/stderr for the exact error",
        "rc" : 127,
        "_ansible_no_log" : false,
        "changed" : false
      },
      "start" : "2020-07-21T08:14:15.365609",
      "end" : "2020-07-21T08:14:16.528185",
      "duration" : 1.162576,
      "ignore_errors" : null,
      "event_loop" : null,a
      "uuid" : "bfb59a41-6672-4115-ba93-1755556b3d11"
    }
  }
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