Description of problem: Non-privileged user can start MigrationPolicy creation, but can not actually create a MigrationPolicy

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

How reproducible:

Steps to Reproduce:
1. Log in as test/test
2. Open MigrationPolicy page
3. Click on "Create MigrationPolicy" button and select "With form"
4. Fill MigrationPolicy form and click "Create" button.

Actual results: Error message appears, the MigrationPolicy is not created

Expected results: "Create MigrationPolicy" button is disabled for non-privileged user, or whole MigrationPolicy page is hidden

Additional info: