Not a perfect test, on failure it _might_ exit with this output:
Process didn't exit successfully:
`/home/cody/g/rust-openssl/openssl/target/debug/openssl-8e712036e3aac4fe`
(signal: 11)
But unclear if we can do any better.
SslStream::{clone,try_clone} are inherently broken since the Ssl object
shared by both streams is only going to be talking to one stream. Stuff
like hyper depends on try_clone, so we'll leave it here for now but
minimize the brokenness to "no worse than what it used to be like".
They'll be removed in 0.8.
cc #325
Steven Fackler