trillian/ctfe: explicitly check for 404 status (#140)
trillian/ctfe: explicitly check for 404 status (#140)

GetProofByHash() for an invalid hash will definitely involve an
RPC to the Trillian Log server, so this test checks that RPC error
NotFound is being mapped correctly to HTTP status 404.
RJPercival/certificate-transparency-go,daviddrysdale/certificate-transparency-go,daviddrysdale/certificate-transparency-go,RJPercival/certificate-transparency-go,RJPercival/certificate-transparency-go,daviddrysdale/certificate-transparency-go,google/certificate-transparency-go,google/certificate-transparency-go,google/certificate-transparency-go