Fix Ironic templates

The merge of ironic-source wasn't actually merging, leading to bad
templates. As part of this add the needed SSH virtual power key
(because like nova-bm, Ironic requires that for now).

We also need to set the compute_manager for nova with Ironic, so that
gets set too.

Change-Id: I0d7d535dbac3584b3eb12865259ee6403e20c98f