Created attachment 760651 [details]
engine log and screenshot

Description of problem:

engine wrongly reports about issues with rhev compatibility issues when trying to attach a new host to cluster that have vdsm version that is not present in it's DB.

I added host with vdsm-4.11* which is not present in DB: 

 engine=# select * from vdc_options where option_name ilike '%version%';
 option_id |           option_name           | option_value  | version
-----------+---------------------------------+---------------+---------
       190 | MinimalETLVersion               | 3.2.0         | general
       223 | OvirtInitialSupportedIsoVersion | 2.5.5         | general
       255 | ProductRPMVersion               | 3.3.0.0       | general
       341 | VdcVersion                      | 3.3.0.0       | general
       304 | SupportedVDSMVersions           | 4.9,4.10 | general
         1 | BootstrapMinimalVdsmVersion     | 4.9           | general


Version-Release number of selected component (if applicable):
rhevm-3.2.0-11.29.el6ev.noarch


How reproducible:
100%

Steps to Reproduce:
1. try to join a non-compatible vdsm-version host to rhev cluster


Actual results:
engine reports:
"Host green-vdsb is compatible with versions (3.0,3.1,3.2,3.3) and cannot join Cluster iscsi2 which is set to version 3.2."

Expected results:
engine should report on the real problem - that vdsm version is not compatible and not rhev version

Additional info:
engine log and screenshot