Merge pull request #2820 from hashicorp/consul

Upates to Consul 0.8.0 and latest Alpine.

library/consul

@@ -1,4 +1,4 @@
 # maintainer: James Phillips <[email protected]> (@slackpad)
 
-latest: git://github.com/hashicorp/docker-consul@22839eee5174a56f31f7ad29005e19c8d5cc25a9 0.X
-0.7.5: git://github.com/hashicorp/docker-consul@22839eee5174a56f31f7ad29005e19c8d5cc25a9 0.X
+latest: git://github.com/hashicorp/docker-consul@12887eb9e0333e49909985b3523ff69c61099e70 0.X
+0.8.0: git://github.com/hashicorp/docker-consul@12887eb9e0333e49909985b3523ff69c61099e70 0.X