test runner can lose individual result messages

[bboreham]

Example: there are 25 tests run, but only 23 of the "finished with success" messages.

>>> Running ./800_plugin_cross_hosts_2_test.sh on [host1-4339-0.us-central1-a.positive-cocoa-90213 host2-4339-0.us-central1-a.positive-cocoa-90213]
>>> Running ./190_no_fastdp_2_test.sh on [host3-4339-0.us-central1-a.positive-cocoa-90213 host4-4339-0.us-central1-a.positive-cocoa-90213]
>>> Running ./685_proxy_weave_run_test.sh on [host5-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./685_proxy_weave_run_test.sh finished with success after 7.4 secs
>>> Running ./680_proxy_hostname_derivation_test.sh on [host5-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./800_plugin_cross_hosts_2_test.sh finished with success after 11.6 secs
>>> Running ./165_reset_2_test.sh on [host1-4339-0.us-central1-a.positive-cocoa-90213 host2-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./190_no_fastdp_2_test.sh finished with success after 17.7 secs
>>> Running ./150_connect_forget_2_test.sh on [host3-4339-0.us-central1-a.positive-cocoa-90213 host4-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./165_reset_2_test.sh finished with success after 19.6 secs
>>> Running ./105_frag_2_test.sh on [host1-4339-0.us-central1-a.positive-cocoa-90213 host2-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./150_connect_forget_2_test.sh finished with success after 19.8 secs
>>> Running ./100_cross_hosts_2_test.sh on [host3-4339-0.us-central1-a.positive-cocoa-90213 host4-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./680_proxy_hostname_derivation_test.sh finished with success after 35.6 secs
>>> Running ./670_proxy_tls_test.sh on [host5-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./670_proxy_tls_test.sh finished with success after 6.7 secs
>>> Running ./666_abuse_of_start_test.sh on [host5-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./100_cross_hosts_2_test.sh finished with success after 22.3 secs
>>> Running ./655_proxy_large_http_chunks_test.sh on [host3-4339-0.us-central1-a.positive-cocoa-90213]
>>> Running ./640_proxy_restart_reattaches_test.sh on [host4-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./666_abuse_of_start_test.sh finished with success after 11.6 secs
>>> Running ./630_proxy_dns_test.sh on [host5-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./655_proxy_large_http_chunks_test.sh finished with success after 6.1 secs
>>> Running ./620_proxy_entrypoint_command_test.sh on [host3-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./640_proxy_restart_reattaches_test.sh finished with success after 16.4 secs
>>> Running ./604_proxy_docker_py_test.sh on [host4-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./620_proxy_entrypoint_command_test.sh finished with success after 11.5 secs
>>> Running ./601_proxy_docker_py_test.sh on [host3-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./630_proxy_dns_test.sh finished with success after 18.2 secs
>>> Running ./500_weave_multi_cidr_test.sh on [host5-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./105_frag_2_test.sh finished with success after 50.4 secs
>>> Running ./295_dns_large_response_test.sh on [host1-4339-0.us-central1-a.positive-cocoa-90213]
>>> Running ./280_with_or_without_dns_test.sh on [host2-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./295_dns_large_response_test.sh finished with success after 9.0 secs
>>> Running ./270_use_name_as_hostname_test.sh on [host1-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./280_with_or_without_dns_test.sh finished with success after 10.3 secs
>>> Running ./265_dns_reverse_test.sh on [host2-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./265_dns_reverse_test.sh finished with success after 13.1 secs
>>> Running ./250_dns_negative_test.sh on [host2-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./250_dns_negative_test.sh finished with success after 7.3 secs
>>> Running ./225_dns_subdomain_test.sh on [host2-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./270_use_name_as_hostname_test.sh finished with success after 21.7 secs
>>> Running ./195_no_multicast_route_1_test.sh on [host1-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./500_weave_multi_cidr_test.sh finished with success after 34.6 secs
>>> Running ./170_ip_reuse_test.sh on [host5-4339-0.us-central1-a.positive-cocoa-90213]
>>> Test ./225_dns_subdomain_test.sh finished with success after 11.0 secs
>>> Test ./170_ip_reuse_test.sh finished with success after 33.8 secs
>>> Test ./604_proxy_docker_py_test.sh finished with success after 81.8 secs
>>> Ran 25 tests, all succeeded