tls: drop bogus key test (#85)
tls: drop bogus key test (#85)

This test is brittle to changes in underlying Go crypto code, and
doesn't add much (just checks passthrough of signature errors) so
drop it.
google/certificate-transparency-go,google/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,RJPercival/certificate-transparency-go