* acl: Add async-cache down policy mode to always do ACL token refreshes in the background to reduce latency. [[GH-3524](https://github.com/hashicorp/consul/issues/3524)]
* catalog: Allow node renaming when node IDs match and the name isn't assigned to another node. [[GH-3974](https://github.com/hashicorp/consul/issues/3974)]
* proxy: Pass through HTTP client env vars to managed proxies so that they can connect back to Consul over HTTPs when not serving HTTP. [[PR-4374](https://github.com/hashicorp/consul/pull/4374)]