friendica-5847 Console Cache List command doesn't work

- filterPrefix => filterArrayKeysByPrefix()
- Logging failed Executions of getAllKeys and get from Memcached

src/Core/Console/Cache.php

@@ -115,10 +115,7 @@ HELP;
 
 		$count = 0;
 		foreach ($keys as $key) {
-			if (empty($prefix) || strpos($key, $prefix) === 0) {
-				$this->out($key);
-				$count++;
-			}
+			$this->out($key);
 		}
 
 		$this->out($count . ' keys found');