integration/ct: emit log prefix in messages
integration/ct: emit log prefix in messages

RJPercival/trillian,daviddrysdale/trillian,Martin2112/trillian,codingllama/trillian,gtank/trillian,AlCutter/trillian,gdbelvin/trillian,daviddrysdale/trillian,gdbelvin/trillian,Martin2112/trillian,AlCutter/trillian,google/trillian,gtank/trillian,google/trillian,RJPercival/trillian,Martin2112/trillian,daviddrysdale/trillian,gdbelvin/trillian,codingllama/trillian