Merge pull request #3047 from hashicorp/consul

Bumps Consul to 0.8.4.

library/consul

@@ -1,4 +1,4 @@
 # maintainer: James Phillips <[email protected]> (@slackpad)
 
-latest: git://github.com/hashicorp/docker-consul@b018ca790f1fabf4175cdde857e33803153a5b02 0.X
-0.8.3: git://github.com/hashicorp/docker-consul@b018ca790f1fabf4175cdde857e33803153a5b02 0.X
+latest: git://github.com/hashicorp/docker-consul@bd6dfdff679131b7c39ca956d6905c28fcb54dab 0.X
+0.8.4: git://github.com/hashicorp/docker-consul@bd6dfdff679131b7c39ca956d6905c28fcb54dab 0.X