tempest: toggle allow_port_security_disabled=True

This enables a new test in Tempest to run on a per-branch
basis since by default it's disabled because it won't pass
on liberty given the bug fix isn't in liberty and won't be
backported there.

Depends-On: I20b8d5d2a300c83a59bdb33374fc20447ce2ede3

Change-Id: I18fd5e0978795fec39a763e1e0f07d758905b9b8
Related-Bug: #1175464
diff --git a/lib/tempest b/lib/tempest
index d1e56a4..9182fea 100644
--- a/lib/tempest
+++ b/lib/tempest
@@ -352,6 +352,8 @@
         iniset $TEMPEST_CONFIG compute max_microversion $tempest_compute_max_microversion
     fi
 
+    # TODO(mriedem): Remove allow_port_security_disabled after liberty-eol.
+    iniset $TEMPEST_CONFIG compute-feature-enabled allow_port_security_disabled True
     iniset $TEMPEST_CONFIG compute-feature-enabled personality ${ENABLE_FILE_INJECTION:-False}
     iniset $TEMPEST_CONFIG compute-feature-enabled resize True
     iniset $TEMPEST_CONFIG compute-feature-enabled live_migration ${LIVE_MIGRATION_AVAILABLE:-False}