OpenStack Packageset Updates

[Chris MacNaughton]

Hey Rafael,
> I've identified a couple more packages that are only partially in the
> OpenStack Packageset:
>
> Magnum and heat-dashboard are in the packageset everywhere except in Focal!

In addition to the above, a few more that I've identified as missing
generally are:

- python-aodhclient
- python-blazarclient
- python-neutron-lib

Thanks!
Chris MacNaughton