Skip test_list_network_filter_provider_attributes when no provider_vlans

When no provider VLAN networks have been configured,
test_list_network_filter_provider_attributes has to be skipped.

This test was added recently [1] and it assumes some provider_vlans are
always configured, but that is not the case (default value is []).

[1] https://review.opendev.org/c/openstack/neutron-tempest-plugin/+/949975

Related-Bug: #2109354
Change-Id: Icde987373202d084d5771456739985a709af3241
Signed-off-by: Eduardo Olivares <eolivare@redhat.com>
1 file changed