TestStartStopReload is flaky

[crawshaw]

Running on go version go1.12.1 darwin/amd64:

$ go test
--- FAIL: TestStartStopReload (0.62s)
    littleboss_test.go:153: echo_server address: "addr=[::]:54901"
    littleboss_test.go:176: reload failed: exit status 1: reload of echo_server failed: wait: no child processes
        
        echo_server output:
        SupervisorInit called
        addr=[::]:54901
        littleboss: reload requested
        entering lameduck mode
        littleboss: exit: wait: no child processes
FAIL
exit status 1
FAIL    crawshaw.io/littleboss  3.980s