base-files: add an ftp group as well

SVN-Revision: 26136

package/base-files/files/etc/group

@@ -4,6 +4,7 @@ adm:x:4:
 mail:x:8:
 audio:x:29:
 www-data:x:33:
+ftp:x:55:
 users:x:100:
 network:x:101:
 nogroup:x:65534: