fix XMLRPC server tests

We test against the MockAPICore now since the tests are meant to ensure
the general functionality of accepting XML and correctly calling
APICalls works, not that the API retu

fix XMLRPC server tests

We test against the MockAPICore now since the tests are meant to ensure
the general functionality of accepting XML and correctly calling
APICalls works, not that the API returns the right things (this is
tested in the ApiCore tests).
Since we no longer use dates but always integers, we no longer need to
handle that.

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