Delete python-keyczar==0.716

[philipphomberger]

Keyczar is deprecated. See: https://github.com/google/keyczar

Critical Vunability: https://www.cve.org/CVERecord?id=CVE-2013-7459

I checkout the codebase and not find this libary is still in use. In the requirements-pants.txt i find that information:

was in fixed-requirements.txt, but not in requirements-pants.txt

keyczar is used by a python2-only test.

#python-keyczar

So because Python 2 is not in use I think this can be remove. Please let me know if I am wrong. I am happy to learn.

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:x: Philipp Homberger
:x: snyk-bot

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