Add tests for the 'trusted' attribute in port resource

This patch adds admin API tests for the trusted attribute of the port
resources. Tests are checking if port created with 'trusted' attribute
set have it set correctly in 'trusted' attribute and in the
binding:profile. Second test checks the same but using update port API
call.

Depends-On: https://review.opendev.org/c/openstack/neutron/+/926068

Related-Bug: #2060916
Change-Id: Idcadaed240f156312fbe38eb9b20c9699eea3282
2 files changed