Fixing SFC

Fixes the changes made in RO to allow SFC to be working again.
Takes care of the dependencies when deleting the different parts,
such as SFIs, SFs, Classifications and SFPs.

Change-Id: Ifc408fae6ea33b6e1c7c0096106150069b62cc91
Signed-off-by: Eduardo Sousa <esousa@whitestack.com>