skel: mark as obsolete/deprecated certain dropped properties

Due to confusion as to what was and was not released, some properties in 2.6 where changed but not marked as deprecated or obsolete.

Repaired by this patch.

Reinstalled and ran instance.  Ran dcache check-config to make sure warnings were correct.

Target: 2.6
Patch: http://rb.dcache.org/r/5793/
Ticket: http://rt.dcache.org/Ticket/Display.html?id=7925
Require-book: no
Require-notes: no
Acked-by: Gerd
Merge pull request #136 from alrossi/fix/2.6/deleted_properties

skel: mark as obsolete/deprecated certain dropped properties