Adding capwap features

Adding capwap features

1) Feature Tests Pass: https://jenkins.opendaylight.org/releng/job/capwap-merge-master/4/
2) Features Comply with Guidelines: https://git.opendaylight.org/gerrit/gitweb?p=capwap.git;a=blob;f=features/src/main/features/features.xml;h=7a747ce3bd157bde730c475e5f91c010d6aaf877;hb=HEAD
	a) Feature Names: Prefixed with 'odl-' : odl-capwap-ac-rest
	b) Features Descriptions: Present
	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-capwap-ac-rest
	b) feature:install odl-integration-compatible-with-all
4) Integration Test Impact - none

Change-Id: I7bd315f3bcaf9fbb21003cf978089b803b356b16
Signed-off-by: Navin Agrawal <anavin@gmail.com>