Comment 12 for bug 1881558

Hey

I noticed that port created during this test having IPv6 HAS NO dhcpv6 options set:

stack@mjozefcz-tempest-plugin-failed-install:~/neutron/neutron$ openstack subnet show 307d0cc8-481f-4052-b933-e4eaa84c1e53
+----------------------+--------------------------------------------------------------------------------------------------------------------------------------------------+
| Field | Value |
+----------------------+--------------------------------------------------------------------------------------------------------------------------------------------------+
| allocation_pools | 2001:db8::2-2001:db8::ffff:ffff:ffff:ffff |
| cidr | 2001:db8::/64 |
| created_at | 2020-06-08T13:45:55Z |
| description | |
| dns_nameservers | |
| dns_publish_fixed_ip | False |
| enable_dhcp | True |
| gateway_ip | 2001:db8::1 |
| host_routes | |
| id | 307d0cc8-481f-4052-b933-e4eaa84c1e53 |
| ip_version | 6 |
| ipv6_address_mode | slaac |
| ipv6_ra_mode | slaac |
| location | cloud='', project.domain_id=, project.domain_name=, project.id='97ab32e6e26143f9938405a6e36180f7', project.name=, region_name='RegionOne', zone= |
| name | |
| network_id | d2dcc8be-de00-4010-b7f6-5e462294a0f1 |
| prefix_length | None |
| project_id | 97ab32e6e26143f9938405a6e36180f7 |
| revision_number | 0 |
| segment_id | None |
| service_types | |
| subnetpool_id | None |
| tags | |
| updated_at | 2020-06-08T13:45:55Z |
+----------------------+--------------------------------------------------------------------------------------------------------------------------------------------------+
stack@mjozefcz-tempest-plugin-failed-install:~/neutron/neutron$

because of the function 'is_dhcp_options_ignored()' the DHCP options for IPv6 subnets are not added to the IPv6 subnet, while it is created with ipv6_address_mode == 'slaac'.
https://review.opendev.org/#/c/461005/4/networking_ovn/common/utils.py

I mocked this function to return "True" in all cases and the DHCP options are inserted after it.