Make sure to do priority app upgrades first

Otherwise those apps might not be loaded when the others app migrations
are running. The previous loading of authentication apps in the upgrade
step never worked as it just returns in maintenance mode

Signed-off-by: Julius Härtl <jus@bitgrid.net>

lib/private/Updater.php

@@ -267,7 +267,6 @@ class Updater extends BasicEmitter {
 		$this->upgradeAppStoreApps($autoDisabledApps, true);
 
 		// install new shipped apps on upgrade
-		OC_App::loadApps(['authentication']);
 		$errors = Installer::installShippedApps(true);
 		foreach ($errors as $appId => $exception) {
 			/** @var \Exception $exception */
@@ -332,7 +331,8 @@ class Updater extends BasicEmitter {
 				$stacks[$pseudoOtherType][] = $appId;
 			}
 		}
-		foreach ($stacks as $type => $stack) {
+		foreach (array_merge($priorityTypes, [$pseudoOtherType]) as $type) {
+			$stack = $stacks[$type];
 			foreach ($stack as $appId) {
 				if (\OC_App::shouldUpgrade($appId)) {
 					$this->emit('\OC\Updater', 'appUpgradeStarted', [$appId, \OC_App::getAppVersion($appId)]);