maybe this fixes the Mysql server has gone error? I think it does not really...

maybe this fixes the Mysql server has gone error? I think it does not really uninstall columns but adds them all the time.

core/Plugin/Manager.php

@@ -1291,7 +1291,7 @@ class Manager extends Singleton
     /**
      * @param $pluginName
      */
-    private function executePluginUninstall($pluginName)
+    public function executePluginUninstall($pluginName)
     {
         try {
             $plugin = $this->getLoadedPlugin($pluginName);

tests/PHPUnit/Fixture.php

@@ -311,9 +311,10 @@ class Fixture extends PHPUnit_Framework_Assert
     public static function unloadAllPlugins()
     {
         try {
-            $plugins = \Piwik\Plugin\Manager::getInstance()->getLoadedPlugins();
+            $manager = \Piwik\Plugin\Manager::getInstance();
+            $plugins = $manager->getLoadedPlugins();
             foreach ($plugins AS $plugin) {
-                $plugin->uninstall();
+                $manager->executePluginUninstall($plugin->getPluginName());
             }
             \Piwik\Plugin\Manager::getInstance()->unloadPlugins();
         } catch (Exception $e) {