Bug 9015 - Unable to install group

Bug 9015 - Unable to install group

The code checking the response for the RPC was incorrectly assuming the future would return and Rpcresult.result

This job had extra debugging to show the result is coming back as null:

https://logs.opendaylight.org/releng/jenkins092/netvirt-csit-1node-openstack-ocata-gate-stateful-nitrogen/123/odl1_karaf.log.gz

2017-08-20 04:24:59,096 | INFO  | nPool-1-worker-0 | NexthopManager                   | 302 - org.opendaylight.netvirt.fibmanager-impl - 0.5.0.SNAPSHOT | Group 150000 with key nexthop.10000050.0.0.2/32 has been successfully installed directly on dpn 273623493589781. rpcResult: RpcResult [successful=true, result=null, errors=[]], isSuccessful: RpcResult [successful=true, result=null, errors=[]], getResult: true

Change-Id: Ie1717102b19aca85043ff7ddbba6bce6fbd6799d
Signed-off-by: Sam Hague <shague@redhat.com>