Addding Natapp features

Addding Natapp features

1) Feature Tests Pass: https://jenkins.opendaylight.org/releng/view/natapp/job/natapp-merge-boron/org.opendaylight.natapp$natapp-features/
2) Features Comply with Guidelines: https://jenkins.opendaylight.org/releng/view/natapp/job/natapp-merge-boron/org.opendaylight.natapp$natapp-features/lastSuccessfulBuild/artifact/org.opendaylight.natapp/natapp-features/0.1.0-SNAPSHOT/natapp-features-0.1.0-SNAPSHOT-features.xml
	a) Feature Names (prefixed with 'odl-'): odl-natapp
	b) Features Descriptions: "OpenDaylight :: natapp"
	c) Features Start-Levels: NA
3) Features Tested: Features have been tested for functionality with
	a) feature:install odl-natapp
	b) feature:install odl-natapp, odl-integration-compatible-with-all
4) Integration Test Impact: Nil

Change-Id: Iac1024220c575854451b5d8b91c42a01a2691a78
Signed-off-by: Thomas Lee S <thomaslee.s@tcs.com>