PSR-2 lint fixes in lib/ directory

lib/SimpleSAML/AuthMemCookie.php

lib/SimpleSAML/IdP/IFrameLogoutHandler.php

lib/SimpleSAML/IdP/LogoutHandlerInterface.php

lib/SimpleSAML/IdP/TraditionalLogoutHandler.php

lib/SimpleSAML/Locale/Localization.php

lib/SimpleSAML/Locale/Translate.php

lib/SimpleSAML/Logger.php

lib/SimpleSAML/Memcache.php

lib/SimpleSAML/Metadata/MetaDataStorageHandler.php

lib/SimpleSAML/Metadata/MetaDataStorageHandlerPdo.php

lib/SimpleSAML/Metadata/MetaDataStorageHandlerSerialize.php

lib/SimpleSAML/Metadata/MetaDataStorageHandlerXML.php

lib/SimpleSAML/Metadata/MetaDataStorageSource.php

lib/SimpleSAML/Metadata/SAMLBuilder.php

lib/SimpleSAML/Metadata/SAMLParser.php

lib/SimpleSAML/Metadata/Signer.php

lib/SimpleSAML/Session.php

lib/SimpleSAML/Stats.php

lib/SimpleSAML/Utils/Attributes.php

lib/SimpleSAML/Utils/Auth.php