Revert "restapi : Create user API fails in SDK & CLI fails"

This reverts commit 072cd7f069539649e22ad6d47853dd9055d74d02.

The reason for reverting it is that it introduces a NPE in the
generation of the links for "job" entities.

A better way to solve the original issue is to fix it in the Python SDK:

  http://gerrit.ovirt.org/32044

Change-Id: Id11acede0350989a2921f32f955e17404bd595c1
Bug-Url: https://bugzilla.redhat.com/1134233
Related-To: https://bugzilla.redhat.com/1122589
Signed-off-by: Juan Hernandez <juan.hernandez@redhat.com>