4557: Support WSGI server "bjoern"


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Describe the enhancement and the motivation for it.

Speed up reviewboard usage.

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Please provide any additional information below.

I like to request to support "bjoern" as a WSGI server. It seems way faster than nginx and apache with WSGI plugins. Also it is really small to use it as an "embedded" or "out of the box" solution to simplify installation of reviewboard for "first time users" as it is installable by "pip install bjoern".

Comparison: https://blog.appdynamics.com/engineering/a-performance-analysis-of-python-wsgi-servers-part-2/