Remove 'allow_port_security_disabled' option

The allow_port_security_disabled option had been added as a temporary
option for skipping the test on Liberty. Current Tempest doesn't support
Liberty, so this patch removes the config option from Tempest.

Change-Id: Ia7d7f3f545e7582be3c3f005576adceede5e97cb

releasenotes/notes/remove-deprecated-allow_port_security_disabled-option-d0ffaeb2e7817707.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    The deprecated config option 'allow_port_security_disabled' from compute_feature_enabled
+    group has been removed.

tempest/config.py

@@ -336,15 +336,6 @@ compute_features_group = cfg.OptGroup(name='compute-feature-enabled',
                                       title="Enabled Compute Service Features")
 
 ComputeFeaturesGroup = [
-    # NOTE(mriedem): This is a feature toggle for bug 1175464 which is fixed in
-    # mitaka and newton. This option can be removed after liberty-eol.
-    cfg.BoolOpt('allow_port_security_disabled',
-                default=True,
-                help='Does the test environment support creating ports in a '
-                     'network where port security is disabled?',
-                deprecated_for_removal=True,
-                deprecated_reason='This config switch was added for Liberty '
-                                  'which is not supported anymore.'),
     cfg.BoolOpt('disk_config',
                 default=True,
                 help="If false, skip disk config tests"),

tempest/scenario/test_security_groups_basic_ops.py

@@ -625,9 +625,6 @@ class TestSecurityGroupsBasicOps(manager.NetworkScenarioTest):
     @test.attr(type='slow')
     @test.requires_ext(service='network', extension='port-security')
     @decorators.idempotent_id('13ccf253-e5ad-424b-9c4a-97b88a026699')
-    @testtools.skipUnless(
-        CONF.compute_feature_enabled.allow_port_security_disabled,
-        'Port security must be enabled.')
     # TODO(mriedem): We shouldn't actually need to check this since neutron
     # disables the port_security extension by default, but the problem is nova
     # assumes port_security_enabled=True if it's not set on the network