After creating a router and attaching interface - Router port status is DOWN

When creating a router in Openstack and attaching interfaces their status is DOWN.

How to reproduce
================
1. Create a router

1. neutron router-create <router>
   2. Attach interface
2. neutron router-interface-add <router> <subnet>
   3. List the ports of the router
3. neutron router port-list <router>
   4. Verify the interfaces' status is DOWN
4. neutron port-show <port>

Version
=======
RHEL7.2
opendaylight-1.0.0-4.el7ost.noarch
openvswitch-2.4.0-2.el7_2.x86_64
python-networking-odl-1.0.1-1.el7ost.noarch