Adding sfc features

1) Feature Tests Pass: https://jenkins.opendaylight.org/sfc/job/sfc-merge/org.opendaylight.sfc$features-sfcofl2/56/testReport/

2) Features Comply with Guidelines: https://git.opendaylight.org/gerrit/gitweb?p=sfc.git;a=blob;f=features-sfcofl2/src/main/resources/features.xml;h=431e943f0bea488e9272f3a19ae935df0012bc1c;hb=HEAD
a) Feature Names: Prefixed with 'odl-' : odl-sfcofl2
b) Features Descriptions: OpenDaylight :: sfcofl2
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-sfcofl2

4) Integration Test Impact: none

Change-Id: I662a0a3359dfd4a8c9a373c22320d3478b59fa0e
Signed-off-by: David Goldberg <david.goldberg@contextream.com>