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This is to use with tests that are not documented in the RFC and where
the response of the server is unknown. We think it is good that the server
do not crash when facing those tests.

and output IP on error

Use level of 30 (legal) for the truncated check in order to avoid
regression with the tests.

Do not return any state from the print_result method. The success's
state should already be known when calling this method.

Do not print error, instead raise an exception that need to be caught.
The calling method will then decide if the error should be displayed or
not.

Fix regression inserted with 8cba1a31

Use an underscore '_' in front of the function name.

All the options are now stored in an object.