subcommand restructure and bashstyle refactor. closes #1579

plugins/nginx-vhosts/functions

@@ -110,6 +110,7 @@ validate_ssl_domains() {
 }
 
 get_custom_nginx_template() {
+  local desc="attempts to copy custom nginx template from app image"
   local APP="$1"; verify_app_name "$APP"
   local DESTINATION="$2"
   local IMAGE_TAG="$(get_running_image_tag "$APP")"