Move marconi under openstack

Marconi was recently accepted as an incubated project and as part of its
incubation, it's being moved under the openstack organization.

Meeting logs:
http://eavesdrop.openstack.org/meetings/tc/2013/tc.2013-09-03-20.01.html

Change-Id: Ie7c40be5f9cb3bdaec8dfcdf5f4c0f5e26b1ebad