drop SimpleTest compatibility

apps/files_encryption/test/crypt.php

apps/files_encryption/test/proxy.php

apps/files_encryption/test/stream.php

apps/files_encryption/test/util.php

apps/files_external/tests/ftp.php

apps/user_ldap/tests/group_ldap.php

tests/bootstrap.php

tests/lib/archive.php

tests/lib/cache.php

tests/lib/db.php

tests/lib/dbschema.php

tests/lib/filestorage.php

tests/lib/filesystem.php

tests/lib/geo.php

tests/lib/group.php

tests/lib/group/backend.php

tests/lib/helper.php

tests/lib/share/share.php

tests/lib/streamwrappers.php

tests/lib/template.php