Nova provides a mechanism to set static vendordata via a file [1].
This patch provides support in Kolla Ansible for using this
feature.
Arguably this could be part of a generic mechansim for copying
arbitrary config, but:
- It's not clear if there is anything else that would take
advantage of this
- One size might not fit all
[1] https://docs.openstack.org/nova/latest/configuration/config.html#api.vendordata_jsonfile_path
Change-Id: Id420376d96d0c40415c369ae8dd36e845a781820
9af42fcebc