Description of problem:
For serial console, rhevm 3.6 feature (For RFE see [1]),
REST API documentation for how to configure it is missing.
[2] and [3] configuration steps should be documented.

[1] Bug 1223671 - [RFE] Provide interface to access guest serial console 
[2] Bug 1254445 - REST API: missing support for ssh keys handling 
[3] Bug 1321582 - [RESTAPI] Add support for VM "Enable VirtIO serial console"

Version-Release number of selected component (if applicable):
3.6.5-4

Additional info:

Example for [2], above:
======================
 /post/get/put/delete over REST API for the serial-console key management.
In order to create a new key, use this syntax:
Method: PUT      URL:  https://<engine fqdn>/ovirt-engine/api/users/00000018-0018-0018-0018-0000000001dc/sshpublickeys/KEY_ID_HERE 


Request Header: 
Name                    	Header Value
Content-type	application/xml
Accept	application/xml

Body:

<ssh_public_key>
<content>ssh-dsa  
. . . 
</content>
</ssh_public_key>