remove the server command (which makes no sense anymore)

server.provision.inc

-<?php
-
-/**
- */
-function drush_provision_server() {
-  _provision_create_dir(drush_get_option('config_path'), dt('Provision configuration'), 0711);
-  _provision_create_dir(drush_get_option('config_path') . '/includes', dt('Provision PHP configuration'), 0711);
-}