Fix rpc in glance and mappings

There is a data mapping for rpc_user in hiera_data that
was missing its mappings. This patch adds them, along with
a missing mapping for the glance rabbit class, and the glance
rabbit class itself.

Change-Id: I83e3fe27801f02046723715e350a49104a41cdeb
Merge "Fix rpc in glance and mappings"