Working features file and karaf distro

This feature file works, and has a test to keep it working.

You can try it out with

cd distributions/karaf
mvn clean install
cd target/assembly/bin
./karaf

Then point mininet at it (you can see logs with
log:display) and checkout:

http://localhost:8181/restconf/operational/network-topology:network-topology/

(note the port 8181, not port 8080)

Change-Id: I70fd72cba621be12605f8d65101536a782b7f8ab
Signed-off-by: Ed Warnicke <eaw@cisco.com>