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These classes will allow to more cleanly provide asset
information through the chain of commands.

Only the cleanup of beat.cmdline was executed. beat.core
generated data were left as is.

Now cleaner and centralized

This allows to make the test files less crowded.

This will make use of Django LiveServerTestCase and will
allow to properly test the WebAPI class as currently the
Django REST framework client is used.

Rather than doing things manually, rely on a known
and proven library to do the web requests.

Also, fail directly in this central point. There's
no sense in propagating returning invalid values and
status that must be checked again at every call.

[docedit] removed Biometrics Evaluation from BEAT definition

See merge request !76