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Add a new `wendelin-telecom-gateway` software type to the fluentd software release for use with Wendelin Telecom.

Instead of having to input the whole configuration as an instance parameter, this software type only requires a few necessary parameters to complete a pre-defined configuration template, which makes deployment easier for this specific use case.

**UPDATE**: As per the discussions below, this has been changed to make `wendelin-telecom-gateway` a new, more generic `default` software type intended to be used as a Wendelin gateway.

The current `default` type is moved to a new `expert` type, allowing the use of a custom fluentd configuration as before.

/reviewed-on nexedi/slapos!1622