
If conf.nova.ironic.memcache_secret_key is not explicitly set, derive it from endpoints.oslo_cache.auth.memcache_secret_key or use a random value. This means when installing charts where we explicitly set endpoints.oslo_cache.auth.memcache_secret_key upgrades without changes won't churn. Change-Id: I686297e25627d88ff9bd32df0a3f7ee8afc11f58