Merge "Run nova-next without periodic cache healing"

.zuul.yaml

@@ -422,6 +422,10 @@
               # reduce the number of placement calls in steady state. Added in
               # Stein.
               resource_provider_association_refresh: 0
+              # Neutron networking backends today are expected to work without
+              # the periodic healing of the cache in Nova. Turn it off to gain
+              # additional performance.
+              heal_instance_info_cache_interval: -1
             workarounds:
               # This wa is an improvement on hard reboot that cannot be turned
               # on unconditionally. But we know that ml2/ovs sends plug time