Hi Maciej
We took the decision in 2.3 to remove features.conf from SAIL/SARK control. It doesn't need any real help from us. You can still modify it if you wish. Just use general edit. HOwever, thanks for pointing this out because it looks like we didn't package the change as well as we might have.
To remove it completely from SAIL/SARK control do...
[root@switch ~]# db selintra delete features.conf
[root@switch ~]# db selintra-work delete features.conf
All done. I'll put the deletes into the next 2.3 point release.
Best
Jeff