[json] fix json serialization for recent simplejson implementation, and test encoding of entities as with earlier simplejson implementation, iterencode internal stuff is a generated function, we can't anymore rely on the _iterencode overriding trick, so move on by stoping isinstance(Entity, dict). This is a much heavier change than expected but it was expected to be done at some point, so let's go that way.

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from os.path import join

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from cubicweb.toolsutils import create_dir

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option_renamed('pyro-application-id', 'pyro-instance-id')

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create_dir(join(config.appdatahome, 'backup'))