Bugfixings for Cache-Lock

- used wrong cachekey in set
- therefore added an abstraction to avoid wrong key concatenation
- forgot to increase the db-version to 1275

src/Core/Cache/AbstractCacheDriver.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Friendica\Core\Cache;
+use Friendica\BaseObject;
+
+
+/**
+ * Abstract class for common used functions
+ *
+ * Class AbstractCacheDriver
+ *
+ * @package Friendica\Core\Cache
+ */
+abstract class AbstractCacheDriver extends BaseObject implements IMemoryCacheDriver
+{
+	/**
+	 * @param string $key	The original key
+	 * @return string		The cache key used for the cache
+	 */
+	protected function getCacheKey($key) {
+		return self::getApp()->get_hostname() . ":" . $key;
+	}
+}