* agent: Added a check which prevents advertising or setting a service to a zero address (`0.0.0.0`, `[::]`, `::`). [GH-2961]
* agent: Added a method for gracefully transitioning to TLS on an existing cluster. [GH-1705]
* agnet: Removed SCADA-related code for Atlas and deprecated all Atlas-related configuration options. [GH-3032]
BUG FIXES:
* agent: Fixed an issue where NAT-configured agents with a non-routable advertise address would refuse to make RPC connections to Consul servers. This was a regression related to GH-2822 in Consul 0.8.2. [GH-3028]
* build: Added a vendor fix to allow compilation on Illumos. [GH-3024]