Description of problem:
conversion_host_enable.yml fails if .ssh directory not present under ~vdsm

Version-Release number of selected component (if applicable):
IMS 1.1

How reproducible:
Always

Steps to Reproduce:
1.  Have a rhv host that doesn't have .ssh dir present
2.
3.

Actual results:
    "msg": "non-zero return code", 
    "rc": 1, 
    "start": "2019-03-21 13:04:31.231980", 
    "stderr": "Saving key \"/.ssh/id_rsa\" failed: No such file or directory", 
    "stderr_lines": [
        "Saving key \"/.ssh/id_rsa\" failed: No such file or directory"
    ], 
    "stdout": "Generating public/private rsa key pair.", 
    "stdout_lines": [
        "Generating public/private rsa key pair."
    ]

Expected results:
Playbook is successful.

Additional info:
Created PR for master:
https://github.com/oVirt/v2v-conversion-host/pull/48
IMS 1.1:
https://github.com/oVirt/v2v-conversion-host/pull/47