Test serverset::tests::waits_if_all_unhealthy is flaky

[stuhood]

thread 'tests::waits_if_all_unhealthy' panicked at 'assertion failed: start.elapsed() > Duration::from_millis(10)', serverset/src/lib.rs:437:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
             at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1: std::sys_common::backtrace::print
             at libstd/sys_common/backtrace.rs:71
             at libstd/sys_common/backtrace.rs:59
   2: std::panicking::default_hook::{{closure}}
             at libstd/panicking.rs:211
   3: std::panicking::default_hook
             at libstd/panicking.rs:227
   4: std::panicking::rust_panic_with_hook
             at libstd/panicking.rs:476
   5: std::panicking::begin_panic
             at libstd/panicking.rs:410
   6: serverset::tests::waits_if_all_unhealthy
             at serverset/src/lib.rs:437
   7: serverset::tests::waits_if_all_unhealthy::{{closure}}
             at serverset/src/lib.rs:422
   8: core::ops::function::FnOnce::call_once
             at libcore/ops/function.rs:238
   9: <F as alloc::boxed::FnBox<A>>::call_box
             at libtest/lib.rs:1468
             at libcore/ops/function.rs:238
             at liballoc/boxed.rs:672
  10: __rust_maybe_catch_panic
             at libpanic_unwind/lib.rs:102
test tests::waits_if_all_unhealthy ... FAILED

[illicitonion]

On it :)