Bug 36640: Remove fnAddFilters

Bug 36640: Remove fnAddFilters

Also centralize and clean the delay code to use DT's debounce.

I have commented the code from initComplete as I don't think it's the
right place. Maybe we need to add it for other table, but then it should
be added when we init DT.

Removed blacklist_keys to keep code clean, could be re-added later if we
really need it.

Signed-off-by: Jake Deery <jake.deery@ptfs-europe.com>
Signed-off-by: Lisette Scheer <lisette@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>