[MapProxy] MapProxy on Ubuntu 20.04

[Sebastiaan Couwenberg]

`apt install mapproxy` works fine on focal.

focal has mapproxy (1.12.0-1) [0] like Debian unstable, and only provide
the packages for Python 3.

There are no focal rebuilds with the newer gdal in the UbuntuGIS PPA
yet, the only packages for focal were for grass. [1]

[0] https://launchpad.net/ubuntu/+source/mapproxy
[1]
https://launchpad.net/~ubuntugis/+archive/ubuntu/ubuntugis-unstable/+packages?field.status_filter=published&field.series_filter=focal

Kind Regards,

Bas

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