PHRAS-4011 : Moving cmd from console to setup - system:clear-cache system:clear-session (#4460)

* cmd clear cache in bin/setup

* Change maintenance state wording

lib/Alchemy/Phrasea/Command/Setup/SystemClearSessionCacheCommand.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace Alchemy\Phrasea\Command\Setup;
+
+use Alchemy\Phrasea\Cache\Factory;
+use Alchemy\Phrasea\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class SystemClearSessionCacheCommand extends Command
+{
+    public function __construct()
+    {
+        parent::__construct('system:clear-session-cache');
+
+        $this->setDescription('Empties session cache in redis, ends sessions for all users');
+
+        return $this;
+    }
+
+    protected function doExecute(InputInterface $input, OutputInterface $output)
+    {
+        /** @var Factory $cacheFactory */
+        $cacheFactory = $this->container['phraseanet.cache-factory'];
+        $cache = $cacheFactory->create('redis', ['host' => 'redis-session', 'port' => '6379']);
+
+        $flushOK = $cache->removeByPattern('PHPREDIS_SESSION*');
+
+        if ($flushOK) {
+            $output->writeln('session cache in redis successfully flushed!');
+        } else {
+            $output->writeln('flush failed!');
+        }
+
+        return 0;
+    }
+}