core : TemplateOwner can't edit template and add/edit vnic in userportal.

When user have direct TemplateOwner role on template, he can't
edit template in UserPortal and also can't add/edit vnic of template.

Change-Id: I724187757513965ba6557d9d94ce7d3857a521a4
Bug-Url: https://bugzilla.redhat.com/953043
Signed-off-by: Ravi Nori <rnori@redhat.com>