This commit makes several updates to the SFC example.

1. Removes the non-provider network copy of helm charts.
   Now, the provider networks are always used as end
   of chain elements.
2. Removes non-provider network options in setup.sh
3. Provider networks are created using cluster provider
   network intents and applied via 'ncm'.
4. Virtual and provider network interface annotations
   are removed explicitly from the sfc function helm
   charts and are instead are added to the functions
   by using EMCO ovnaction interface intents.
5. The Readme.md is updated.

Signed-off-by: Eric Multanen <eric.w.multanen@intel.com>