Remove upstream in ironic-prometheus-exporter
Remove upstream in ironic-prometheus-exporter

Now the ironic-prometheus-exporter is under opendev[1] we
don't need the `upstream` field.

[1] https://opendev.org/openstack/ironic-prometheus-exporter

Change-Id: I4de6cd98301ebe66a74ef76cdb8e9cb9d7eb0850

javierpena/rdoinfo,redhat-openstack/rdoinfo