Add to runtest variables for vnc_console to compute-feature-enabled

Change-Id: I1ebc83fec4eb70534b04323c3e0a1b8a7c194c7e
PROD: PROD-19544
diff --git a/_modules/runtest/tempest_sections/compute_feature_enabled.py b/_modules/runtest/tempest_sections/compute_feature_enabled.py
index 3f53c01..fe81fe1 100644
--- a/_modules/runtest/tempest_sections/compute_feature_enabled.py
+++ b/_modules/runtest/tempest_sections/compute_feature_enabled.py
@@ -157,4 +157,7 @@
 
     @property
     def vnc_console(self):
-        pass
+        # The vnc is enabled by default in nova-formula, so rely on compute presence.
+        #TODO: fix when value is unhardcoded.
+        return conditions.BaseRule('*.nova.compute.enabled', 'eq', True,
+                            multiple='any').check(self.pillar)