Random test failure: net-test: solipsist sometimes loses messages

A random test failure in https://travis-ci.org/eric/skuld/jobs/30945829#L661 :

```
lein test :only skuld.net-test/solipsist
FAIL in (solipsist) (net_test.clj:26)
expected: (= (set msgs) (set (clojure.core/deref log)))
  actual: (not (= #{{:vec [1/2 yo], :set #{"foo" :a}} {:x 1} {:x "foo"} {:done? true} {:x {:hi 2}}} #{{:vec [1/2 yo], :set #{"foo" :a}} {:x 1} {:done? true} {:x {:hi 2}}}))
```
