Move all commands into subcommand structure

subcommands/expose

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
+set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+source "$PLUGIN_BASE_PATH/common/functions"
+source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
+
+postgres-expose-cmd() {
+  [[ -z $2 ]] && dokku_log_fail "Please specify a name for the service"
+  verify_service_name "$2"
+  service_port_expose "$2" "${@:3}"
+}
+
+postgres-expose-cmd "$@"