sozu-lib beta regression

[est31]

sozu-lib version 0.1.1 test-regressed from stable to beta (full log):

Aug 16 22:18:52.510 INFO blam! ---- network::tcp::tests::mi stdout ----
Aug 16 22:18:52.511 INFO blam! 	thread 'network::tcp::tests::mi' panicked at 'could not parse address: Error { repr: Os { code: 111, message: "Connection refused" } }', /checkout/src/libcore/result.rs:860:4
Aug 16 22:18:52.511 INFO blam! note: Run with `RUST_BACKTRACE=1` for a backtrace.

cc @Geal

[alexcrichton]

This has a sleep in the test for 300ms, racy test.