Remove networking-powervm project from the Neutron stadium section
Remove networking-powervm project from the Neutron stadium section

The project is no longer part of the list and therefore it should
not be linked under this section.

[1] http://governance.openstack.org/reference/projects/neutron.html

Change-Id: I0b6fe8960fc941bea159d670b75bc69126324181

openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals