Adding usc features.

Adding usc features.

1) Feature Tests Pass: https://jenkins.opendaylight.org/releng/view/usc/job/usc-merge-master/5/
2) Features Comply with Guidelines: https://git.opendaylight.org/gerrit/gitweb?p=usc.git;a=blob;f=usc-features/src/main/features/features.xml
	a) Feature Names: odl-usc-all
	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-restconf-all odl-mdsal-apidocs odl-usc-all
	b) feature:install odl-integration-compatible-with-all
4) Integration Test Impact: None

Change-Id: Ieb7cfe730005b8c45b9a59572f57a03c2bd54cc8
Signed-off-by: A H <an.ho@huawei.com>