Description of problem:

I'm updating 3.5 SHE env with EL6 hosts and documentation says:

$url/ovirt-engine/docs/manual/en_US/html/Self-Hosted_Engine_Guide/Upgrading_the_Self-Hosted_Engine_from_6_to_7.html

~~~
6.3. Upgrading a RHEL-Based Self-Hosted Engine from Red Hat Enterprise Linux 6 Hosts to 7 Hosts

The upgrade process involves the following key steps:

* Upgrade the Manager virtual machine to Red Hat Enterprise Virtualization 3.6.
* Upgrade all version 6 hosts to version 7. Re-run hosted-engine --deploy on all self-hosted engine hosts.
* Upgrade the self-hosted engine hosts to Red Hat Enterprise Virtualization 3.6.
* After all hosts in the cluster and the Manager virtual machine have been updated, change the cluster compatibility version to 3.6.
~~~

But while following above procedure, 3.6 engine-setup says:

~~~
...
[ INFO  ] Cleaning stale zombie tasks and commands
          It seems like this engine is self-hosted, and the operating system of some of its hosts is el6 or a variant. Please upgrade the hosts to el7 before upgrading the engine to 3.6.
          Please check the log file for more details.
          Replying "No" will abort Setup.
...
~~~

Thus is it contradictive, exact opposite. IMO the documentation is right, at least in EL6/7 context (we need to EL6/EL7 in cluster, the cluster where HE VM is running).

Version-Release number of selected component (if applicable):
3.6.8.1-0.1.el6

How reproducible:
100%

Steps to Reproduce:
1. have 3.5 SHE env
2. update rpms inside HE VM to 3.6
3. engine-setup

Actual results:
engine-setup instructs exactly opposite to docs

Expected results:
login should match

Additional info: