metadatasvc: checking the initCrypto error

Missed the real checking for the initCrypto error.
I have also taken the liberty to slightly change the printing of the error of the setupIPTables call to keep it consistant and use log.Fatal
metadatasvc: changed from fmt to log the setupIPTables

To keep the error handling consistant on the main function I changed the printing of the error from fmt + return to log.Fatal in the setupIPTables