Rename composer hostnames

Previously, all containers had hostnames corresponding to their domains.
This made it impossible to use curl and friends from within the
containers. This commit renames the hostnames of the containers to
append a '.wisski' suffix.

distillery/resources/compose/barrel/docker-compose.yml

@@ -4,7 +4,7 @@ services:
   barrel:
     build: .
     restart: always
-    hostname: ${VIRTUAL_HOST}
+    hostname: ${VIRTUAL_HOST}.wisski
     environment:
       # port and hostname for this image to use
       VIRTUAL_HOST: ${VIRTUAL_HOST}