Updated openstack/openstack
Project: openstack-dev/devstack  464d48ab32eabbd2106024bb019bd042bb479490

Update deprecated service_neutron_metadata_proxy variable

Commit c2697f8735a38fb05d54ff4f82110829ead85ee9 moved
service_neutron_metadata_proxy to the neutron section.

Change-Id: I08cdaae9bded1797c663d1bfeaae61535ce64099