Remove stable/stein testing jobs

stable/stein is not suported in Patrole now, so
let's remove their jobs from master gate.

In order to pass the CI, the following changes are also made:
* Added skip for Nova policy
  "os_compute_api:os-admin-actions:reset_network", which was removed in
  https://review.opendev.org/c/openstack/nova/+/749315
* Removed openstack-tox-lower-constraints job for now until we have a
  solution.

Change-Id: Id73342c24342637edc37104f2112235a2edcac39

.zuul.yaml

@@ -114,15 +114,6 @@
       devstack_localrc:
         USE_PYTHON3: True
 
-- job:
-    name: patrole-member-stein
-    parent: patrole-member
-    nodeset: openstack-single-node-bionic
-    override-checkout: stable/stein
-    vars:
-      devstack_localrc:
-        USE_PYTHON3: True
-
 - job:
     name: patrole-multinode-admin
     parent: patrole-base-multinode
@@ -220,7 +211,6 @@
 - project:
     templates:
       - openstack-cover-jobs
-      - openstack-lower-constraints-jobs
       - openstack-python3-victoria-jobs
       - check-requirements
       - publish-openstack-docs-pti
@@ -233,7 +223,6 @@
         - patrole-member-victoria
         - patrole-member-ussuri
         - patrole-member-train
-        - patrole-member-stein
         - patrole-multinode-admin
         - patrole-multinode-member
         - patrole-multinode-reader
@@ -250,4 +239,3 @@
         - patrole-member-victoria
         - patrole-member-ussuri
         - patrole-member-train
-        - patrole-member-stein

patrole_tempest_plugin/tests/api/compute/test_server_misc_policy_actions_rbac.py

@@ -125,6 +125,9 @@ class MiscPolicyActionsRbacTest(rbac_base.BaseV2ComputeRbacTest):
         with self.override_role():
             self.servers_client.inject_network_info(self.server['id'])
 
+    @testtools.skipIf(
+        CONF.policy_feature_enabled.removed_nova_policies_wallaby,
+        "This API extension policy was removed in Wallaby")
     @utils.requires_ext(extension='os-admin-actions', service='compute')
     @rbac_rule_validation.action(
         service="nova",