This reverts commit 515c29572190158428ac172febbf6871cf8977ee.
We found the reason why nodepool-builder wasn't starting was that when
we had the system-python and upstream-python installed at the same
version at the same time, the upstream-python was not built to use
relative libraries and hence started using the libpython.so from the
system-python. This meant it was looking for libraries installed in
the system-python path (dist-packages) not the pip/upstream path
(site-packages). This was reported and upstream are currently
evaluating a fix for that [1]
In the mean time, we merged Ib3dfda3df69e7ab359b96cd1865e47c7e1e8047b
which also avoids this problem by not including the "unstable" distro
in the image. Since the system-python 3.11 packages were coming from
"unstable", this avoids the "same version" of the problem; the
upstream-python won't pick up the older version's libpython.so.
After this change the image is actually broken with this, because it
directs the system-python (now 3.9 since the change) to the 3.11
libraries, which obviously doesn't work. Thus revert this now.
[1] https://github.com/docker-library/python/pull/785
Change-Id: I814d5920d8203bcb9f60b9769164c3d2a925f526
74ff77e720