integration/ct: get inclusion proof for pre-cert
integration/ct: get inclusion proof for pre-cert

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