Add eman features

Add eman features

1) Feature Tests Pass: https://jenkins.opendaylight.org/releng/view/eman/job/eman-validate-autorelease-nitrogen/lastBuild/
2) Features Comply with Guidelines: I dont' know how to find link to
   feature.xml
a) Feature Names: Prefixed with 'odl-' :
   odl-eman odl-eman-ui odl-eman-api
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
   Features installed and tested locally per: https://wiki.opendaylight.org/view/Karaf:Step_by_Step_Guide#Prepare_your_feature_for_addition_to_the_integration_project
4) Integration Test Impact - none

Change-Id: I9b617d3405c82e0ca7256e3be07834624efaa61a
Signed-off-by: fsandoval <francisrsandoval@gmail.com>