Refactor getInteger/getOptionalInteger

lib/SimpleSAML/Auth/State.php

lib/SimpleSAML/Configuration.php

lib/SimpleSAML/Locale/Language.php

lib/SimpleSAML/Logger.php

lib/SimpleSAML/Logger/SyslogLoggingHandler.php

lib/SimpleSAML/Memcache.php

lib/SimpleSAML/Metadata/SAMLBuilder.php

lib/SimpleSAML/Module.php

lib/SimpleSAML/Session.php

lib/SimpleSAML/SessionHandler.php

lib/SimpleSAML/SessionHandlerStore.php

lib/SimpleSAML/Store/RedisStore.php

modules/core/lib/Auth/Process/ExtendIdPSession.php

modules/core/www/idp/logout-iframe-post.php

modules/saml/lib/Auth/Source/SP.php

modules/saml/lib/IdP/SAML2.php

modules/saml/lib/Message.php

tests/lib/SimpleSAML/ConfigurationTest.php