Replace SimpleSAML_Metadata_* with namespaced version

bin/importPdoMetadata.php

bin/initMDSPdo.php

lib/SimpleSAML/Bindings/Shib13/HTTPPost.php

lib/SimpleSAML/IdP.php

lib/SimpleSAML/Metadata/MetaDataStorageHandler.php

lib/SimpleSAML/Metadata/MetaDataStorageHandlerFlatFile.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/Metadata/Sources/MDQ.php

lib/SimpleSAML/XHTML/IdPDisco.php

lib/SimpleSAML/XML/Shib13/AuthnRequest.php

lib/SimpleSAML/XML/Shib13/AuthnResponse.php

modules/adfs/lib/IdP/ADFS.php

modules/adfs/www/idp/metadata.php

modules/adfs/www/idp/prp.php