Re-enable mistakenly disabled core/signatures tests
Re-enable mistakenly disabled core/signatures tests

alsophian/keytransparency,AMarcedone/keytransparency,cesarghali/keytransparency,gdbelvin/keytransparency,google/keytransparency,cesarghali/keytransparency,alsophian/keytransparency,google/keytransparency,gdbelvin/keytransparency,AMarcedone/keytransparency