Further fixup for Ubuntu cloud images

The official Ubuntu cloud images have some further python pkgs
preinstalled that conflict with our requirements. Allow to
overwrite them.

Signed-off-by: Dr. Jens Harbott <harbott@osism.tech>
Closes-Bug: 1871485
Change-Id: I793c250cae5e7b9bc835b7016d790d1f9ae8a7f3
1 file changed