Horizon network port create panel shows "port security" checkbox that breaks port creation for non-admin users

[Radomir Dopieralski]

When creating a network port, we display the "port security" checkbox even when the user has no right to set it. That results in a policy error when the form is submitted.

We should be checking for the user's rights, and not display that checkbox (and not pass the related parameter in the API call) when those are insufficient for setting it.