Description of problem:
In order to start importing VMs from RHEL Xen, an RSA key pair exchange is required as a prerequisite (see "steps to reproduce").
This procedure is cumbersome, should be done manually for each host in the destination environment (in order to use any host in DC as proxy host) and should be repeated again in case of any change in the keys occur (new host, new key, expired key etc.)
It would be nice to have out of the box experience for this procedure in order to simplify this feature configuration and prevent future failures in case of ssh key exchange is needed again.

Version-Release number of selected component (if applicable):
ovirt-engine-4.0.0-0.0.master.20160423161403

How reproducible:


Steps to Reproduce:
login to host CLI shell and run the next commands: 
1. edit /etc/passwd file
change  
vdsm:x:36:36:Node Virtualization Manager:/var/lib/vdsm:/sbin/nologin
to: 
vdsm:x:36:36:Node Virtualization Manager:/home/vdsm:/bin/bash 
2. Create /home/vdsm directory if it does not exist.
3. chown vdsm directory to vdsm:kvm
4. su - vdsm
5. ssh-keygen
6. ssh root@xen-server-fqdn
7. exit ssh and ssh-copy-id root@xen-server-fqdn
8. Verify authentication from RHEV host to Xen server is now passwordless.