Comment 8 for bug 1130146

Running `OS_STDOUT_CAPTURE=1 OS_STDERR_CAPTURE=1 OS_TEST_TIMEOUT=60 ${PYTHON:-python} -m subunit.run nova.tests.test_libvirt_config` ends with:

time: 2013-02-19 18:28:00.481044Z
test: nova.tests.test_libvirt_config.LibvirtConfigGuestInterfaceTest.test_config_bridge
time: 2013-02-19 18:28:00.501911Z
failure: nova.tests.test_libvirt_config.LibvirtConfigGuestInterfaceTest.test_config_bridge [ multipart
time: 2013-02-19 18:28:00.502121Z
2013-02-19 18:28:00.502 9031 CRITICAL nova [-] 'str' object has no attribute 'content_type'

This last line begins with a timestamp and is not expected by the subunit stream protocol. test_config_bridge is one of the places this is breaking.