add ipv6 support to ansible hosts

[eslutsky]

ansible-runner-service fails to resolve host if its running on ipv6 controller host ,
this issue can be reproduced with this command:

curl -v -H "Accept: application/json" -H "Content-type: application/json" -X POST -d "{}" http://localhost:50001/api/v1/hosts/XXXX/groups/ovirt
* About to connect() to localhost port 50001 (#0)
*   Trying ::1...
* Connected to localhost (::1) port 50001 (#0)
> POST /api/v1/hosts/caracal04.lab.eng.tlv2.redhat.com/groups/ovirt HTTP/1.1
> User-Agent: curl/7.29.0
> Host: localhost:50001
> Accept: application/json
> Content-type: application/json
> Content-Length: 2
> 
* upload completely sent off: 2 out of 2 bytes
< HTTP/1.1 404 NOT FOUND
< Date: Thu, 13 Feb 2020 12:08:29 GMT
< Server: Apache/2.4.6 (Red Hat Enterprise Linux) OpenSSL/1.0.2k-fips mod_wsgi/4.6.4 Python/2.7
< Content-Length: 173
< Content-Type: application/json
< 
{"status": "NOCONN", "msg": "SSH error - 'XXXX' not found; check DNS or /etc/hosts", "data": {"hostname": "XXXX"}}

[mwperina]

Unfortunately this is currently blocking hosted engine installation on EL8 with IPv6 only setup in oVirt 4.4. And we already supported this IPv6 scenario in 4.3.

@machacekondra @dangel101

[mwperina]

Resolved by #51