Merge pull request #2465 from hashicorp/consul

Updates official image to Consul 0.7.2.

library/consul

@@ -1,4 +1,4 @@
 # maintainer: James Phillips <[email protected]> (@slackpad)
 
-latest: git://github.com/hashicorp/docker-consul@2c2873f9d619220d1eef0bc46ec78443f55a10b5 0.X
-0.7.1: git://github.com/hashicorp/docker-consul@2c2873f9d619220d1eef0bc46ec78443f55a10b5 0.X
+latest: git://github.com/hashicorp/docker-consul@81e8c00044cb955a7a232c91dcfcb06611e18cba 0.X
+0.7.2: git://github.com/hashicorp/docker-consul@81e8c00044cb955a7a232c91dcfcb06611e18cba 0.X