#89 Confusing message when running the tests script

Unrecognized PDUs detected: Check 'unrecognized_pdus' table!

When executing `./run_tests`, the first message shown to the user is: ``` Unrecognized PDUs detected: Check 'unrecognized_pdus' table! ``` The message is bound to confuse the user. When running tests, it's desirable to run ID2T in non-verbose mode (assuming that removes that message).