In Kilo Nova deprecated proxying options in the DEFAULT group. Instead
they were moved to the "neutron" group. This resulted in the metadata
service not serving up metadata.
See this bug for more information:
https://bugzilla.redhat.com/show_bug.cgi?id=1217999
Change-Id: I4f7eac0100d31c5329f8d1857f6d7da1bb6784da