Merge pull request #13701 from owncloud/disable-appcode-checker

disable the app code checker - some previous shipped apps cannot be inst...

lib/private/installer.php

@@ -556,7 +556,7 @@ class OC_Installer{
 		);
 
 		// is the code checker enabled?
-		if(OC_Config::getValue('appcodechecker', true)) {
+		if(OC_Config::getValue('appcodechecker', false)) {
 			// check if grep is installed
 			$grep = \OC_Helper::findBinaryPath('grep');
 			if (!$grep) {