client: more info for consistency proof failure
client: more info for consistency proof failure

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