Description of problem:

Can't login as a user via REST API.

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


How reproducible:
always

Steps to Reproduce:
1. Create a user and assgin it a role which is not SuperUser.
2. Try to connect via REST API with this user.
  
Actual results:
<fault>
    <reason>Operation Failed</reason>
    <detail>query execution failed due to insufficient permissions.</detail>
</fault>

Expected results:
User should connect.

Additional info:
Problem is only with url OVIRTENGINE:PORT/api
For example if I try connect with user who has UserVmManager role and try to
connect with curl:

#$ curl -X GET -u user@domain:pass http://url/api/vms

I get list of vms. So the problems seems to be only with /api

Because if I try to do this command:

#$ curl -X GET -H "Filter: true" -u user@domain:pass http://url/api

I get this error:
<fault>
    <reason>Operation Failed</reason>
    <detail>Entity not found: VdcVersion</detail>
</fault>