Merge pull request #17920 from andyboeh/master

Add possibility for alternative logins to force redirection of login page

lib/private/util.php

@@ -948,6 +948,7 @@ class OC_Util {
 
 		$parameters['alt_login'] = OC_App::getAlternativeLogIns();
 		$parameters['rememberLoginAllowed'] = self::rememberLoginAllowed();
+		\OC_Hook::emit('OC_Util', 'pre_displayLoginPage', array('parameters' => $parameters));
 		OC_Template::printGuestPage("", "login", $parameters);
 	}