Added Karaf feature for SFC-UI

New odl-sfc-ui Karaf feature is added to odl-sfc-all.
SFC-UI is available on http://localhost:8181/sfc/index.html

This solution is only temporary because it's not using Dlux Karaf.
Instead it's only using dlux-web mvn bundle as dependency, then it inserts SFC-UI
project files into it creating merged SFC-UI bundle.

Signed-off-by: Andrej Kincel <akincel@cisco.com>, Martin Lauko <malauko@cisco.com>