Rename Utils\HTTP::getSelfHostWithoutPort() to Utils\HTTP::getSelfHostWithNonStandardPort(), change the logic, and reimplement Utils\HTTP::getSelfHost() to depend on use the former. Complete the tests to include the case of port 443 while using HTTPS.

- Add test case
- Fix .gitignore since it ignored all metadata folders

Bugfix. While SimpleSAML\Database::query() returns a PDOStatement, SimpleSAML\Database::exec() doesn't. Make both return an integer with the amount of rows affected. Add a return value to SimpleSAML_Metadata_MetadataStorageHandlerPdo::initDatabase().

Add tests for SimpleSAML\Locale\Language::getDefaultLanguage() and fix other tests for the same class.

Add more tests for SimpleSAML_Configuration::getDefaultEndpoint() and SimpleSAML\Utils\Config\Metadata::getDefaultEndpoint().

Make it possible to pre-load a configuration array into SimpleSAML_Configuration for subsequent calls to getInstance() to use it. This opens up for unit-testing code that calls SimpleSAML_Configuration::getInstance().

(being respectful with occurences that might change the behaviour, i.e. default database prefixes)

Refactor SimpleSAML\Utils\Arrays::normalizeAttributesArray() to SimpleSAML\Utils\Attributes::normalizeAttributesArray().

Refactor SimpleSAML_Auth_State::extractPersistentAuthState() to getPersistentAuthData() to avoid confusions around the behaviour of this method.