start using available_features cfg option from tempest

[1] introduced a new list cfg option to tempest network-feature-enabled
available_features, which can list networking features without and
API extension.
As a first candidate ipv6_metadata can be added to master and victoria
jobs.

[1] https://review.opendev.org/760916

Change-Id: Ib8ba513ad098bb47d401ba64311b92280a85e1b2
diff --git a/zuul.d/queens_jobs.yaml b/zuul.d/queens_jobs.yaml
index b0ee336..682147e 100644
--- a/zuul.d/queens_jobs.yaml
+++ b/zuul.d/queens_jobs.yaml
@@ -65,6 +65,8 @@
         - trunk-details
       network_api_extensions_tempest:
         - dvr
+      network_available_features: &available_features
+        -
       devstack_localrc:
         USE_PYTHON3: false
         CIRROS_VERSION: 0.3.5
@@ -87,6 +89,7 @@
     vars:
       branch_override: stable/queens
       network_api_extensions: *api_extensions
+      network_available_features: *available_features
       # TODO(slaweq): remove trunks subport_connectivity test from blacklist
       # when bug https://bugs.launchpad.net/neutron/+bug/1838760 will be fixed
       # NOTE(bcafarel): remove DNS test as queens pinned version does not have
@@ -117,6 +120,7 @@
     vars:
       branch_override: stable/queens
       network_api_extensions: *api_extensions
+      network_available_features: *available_features
       # NOTE(bcafarel): remove DNS test as queens pinned version does not have
       # fix for https://bugs.launchpad.net/neutron/+bug/1826419
       tempest_black_regex: "\