Adding sfc features

1) Feature Tests Pass: https://jenkins.opendaylight.org/sfc/job/sfc-merge/org.opendaylight.sfc$features-sfc/47/testReport/
2) Features Comply with Guidelines: https://git.opendaylight.org/gerrit/gitweb?p=sfc.git;a=blob;f=features/src/main/resources/features.xml;h=978d57b68cd2154e992674f190d8b9fd189dba76;hb=HEAD
	a) Feature Names: Prefixed with 'odl-' : https://wiki.opendaylight.org/view/Runtime:Karaf_Features_Guidelines#Feature_Naming
	b) Features Descriptions: Present https://wiki.opendaylight.org/view/Runtime:Karaf_Features_Guidelines#Description
	c) Features Start-Levels: No start-levels on <bundle> elements or <feature> elements
3) Features Tested: Features have been tested for functionality with
	a) feature:install odl-sfc-all
4) Integration Test Impact: none

Change-Id: Ic730ac912ef9d991d41ab6da004617a8affb186a
Signed-off-by: paulq <paulq@cisco.com>