Adding Group Based Policy features.

1) Feature Tests Pass: https://jenkins.opendaylight.org/groupbasedpolicy/job/group-based-policy-merge/36/testReport/
2) Features Comply with Guidelines: https://git.opendaylight.org/gerrit/gitweb?p=groupbasedpolicy.git;a=blob;f=features/src/main/resources/features.xml;h=1cf84de9e65ce6983bba8ad96a2c20733337ce22;hb=refs/heads/master
	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-groupbasedpolicy-ofoverlay
4) Integration Test Impact: none

Change-Id: I6c820200f2641ae69b898cba00ff3b0f6309c913
Signed-off-by: Thomas Bachman <tbachman@yahoo.com>