Cache::ALL alwayes deletes whole cache, even when called over namespace

[dg]

Moved from nette/nette#592

[forstjiri]

For my installation, i added Cache::NAMESPACE and this code to Filestorage clean method.

$namespaces = $conditions[Cache::NAMESPACE] ?? false;
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else if($namespaces) {
            if (!is_array($namespaces)) {
                $namespaces = [$namespaces];
            }

            foreach ($namespaces as $namespace) {
                $dir = $this->dir . "/_$namespace";
                $items = Nette\Utils\Finder::findFiles('')->from($dir);
                foreach ($items as $item) {
                    $this->delete($item);
                }
                @rmdir($dir);
		    }
		}
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It seems to work fine.

Also added this to SqlLiteStorage, but havent tested it:

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else if(!empty($conditions[Cache::NAMESPACE])) {
            if (is_array($conditions[Cache::NAMESPACE])) {
                $namespaces = $conditions[Cache::NAMESPACE];
            } else {
                $namespaces = [$conditions[Cache::NAMESPACE]];
            }

            foreach ($namespaces as $namespace) {
                $this->pdo->prepare("DELETE FROM cache WHERE key LIKE %/_$namespace/%")->execute();
            }

		}
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