Make API testable & move PhotoAlbum tests to new destination

tests/Util/AuthenticationDouble.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Friendica\Test\Util;
+
+use Friendica\Security\Authentication;
+
+class AuthenticationDouble extends Authentication
+{
+	protected function setXAccMgmtStatusHeader(array $user_record)
+	{
+		// Don't set any header..
+	}
+}

tests/Util/authtest/authtest.php

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+<?php
+/**
+ * Name: TEST-ADDON: Authentication "allow all"
+ * Description: For testing purpose only
+ * Version: 1.0
+ * Author: Philipp Holzer <admin@philipp.info>
+ */
+
+use Friendica\Core\Hook;
+use Friendica\Model\User;
+
+function authtest_install()
+{
+	Hook::register('authenticate', 'tests/Util/authtest/authtest.php', 'authtest_authenticate');
+}
+
+function authtest_authenticate($a,&$b)
+{
+	$b['authenticated'] = 1;
+	$b['user_record']   = User::getById(42);
+}