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Normalizing can be complicated, as settings depend on each other and possibly conflict. That is, because verify() must exactly anticipate whether normalization will succeed and how the result will look like. That is because we only want to modify the connection, if we are sure that the result will verify. Hence, verify() and normalize() are strongly related. The implementation should not be spread out between NMSettingOvsInterface:verify(), NMSettingOvsPatch:verify() and _normalize_ovs_interface_type(). Also, add some unit-tests.
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