The maintainers of the m2crypto Python package pushed two new versions of the package to PyPI today, version 0.37.0 followed a few hours later by 0.37.1 (https://pypi.org/project/M2Crypto/0.37.1/#history). It appears as though these packages are failing to build/install properly in our image.
The problem was noticed in the Jessie container, where we were not previously explicitly installing the Debian m2crypto package. As part of this PR, I install m2crypto via pip in the Jessie container and pin down the version. I also modified the Stretch and Buster Dockerfiles to install the package vi pip in the same fashion for consistency.
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