Fix typo in roles/Networker.yaml
Fix typo in roles/Networker.yaml

The captialization mismatch here means the role currently doesn't
work.

Change-Id: Iced5004f993f8c100268361d87580d922e47f983

dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates