Apply stack fix to all python containers

[timothyb89]

musl's default stack size is very small (80 KiB) which can cause frequent stack overflows (probably why the agent-collector crashes). See also: https://github.com/voidlinux/void-packages/issues/4147

A workaround was proposed in ultrajson/ultrajson#254 (comment). I've had good results when testing it in the keystone-init container by building the .so as part of the container build process, and we should apply it elsewhere - at least to the agent, which likely needs it most.

Basic steps to implement:

• add stack-fix.c to container
• build with gcc -shared -fPIC /stack-fix.c -o /stack-fix.so
• run python with LD_PRELOAD=/stack-fix.so python ...

[matrixik]

Looks like we probably could remove this fix from containers, we only need to rebuild them with newer Python.

After
docker-library/python@8717dc2
and
docker-library/python@f45e1fb
Newer containers with Python have bigger stack (1 MB). So this problem should not happen again with ujson.

Relevant issue: docker-library/python#211