Updates Consul to release version 0.7.4.

library/consul

@@ -1,4 +1,4 @@
 # maintainer: James Phillips <[email protected]> (@slackpad)
 
-latest: git://github.com/hashicorp/docker-consul@c267a8ce53fc5df512ab3bc132967806bde67e16 0.X
-0.7.3: git://github.com/hashicorp/docker-consul@c267a8ce53fc5df512ab3bc132967806bde67e16 0.X
+latest: git://github.com/hashicorp/docker-consul@47e4cde898e8c51ff62c83cb4c779f2b42841868 0.X
+0.7.4: git://github.com/hashicorp/docker-consul@47e4cde898e8c51ff62c83cb4c779f2b42841868 0.X