Merge pull request #80 from dokku/fix-host

fix: convert underscore to dash in service host

entrypoint

@@ -5,7 +5,7 @@ if [ -n "$SERVICE_TYPE" ] && [ -n "$SERVICE_NAME" ]; then
   service_name=$(echo "$SERVICE_NAME" | tr .- _ | tr '[:lower:]' '[:upper:]')
   host_prefix="DOKKU_${service_type}_${service_name}_PORT_"
   if [ -z "$SERVICE_HOST" ] && [ -z "$SERVICE_HOST_ENV_VAR" ]; then
-    SERVICE_HOST="$(echo "dokku-${service_type}-${service_name}" | tr '[:upper:]' '[:lower:]')"
+    SERVICE_HOST="$(echo "dokku-${service_type}-${service_name}" | tr '[:upper:]' '[:lower:]' | tr _ -)"
   fi
   if [ -z "$SERVICE_PORT" ] && [ -z "$SERVICE_PORT_ENV_VAR" ]; then
     SERVICE_PORT=$(env | sort | grep "$host_prefix" | grep PORT= | head -n1 | cut -d= -f2)