By Sergio Goncalves LISBON (Reuters) – Portugal’s Prime Minister Antonio Costa has urged the European Central Bank (ECB) to be prudent in raising interest rates from abnormally low levels, despite not expecting a dramatic increase in household bad loans in his country. The ECB has been unwinding policy support over the past year and lifted rates by a total of 125 basis points at its past two meetings, its fastest pace of policy tightening so far. Costa said he “understands the logic of normalizing monetary policy”. “(But) I think that the ECB, in all its independence, should be prudent in rais…