xml console output reported to be empty when json test passes

[Giulio Fidente]

for some runs the XML interface is failing "test_get_console_output" as if the console was empty

note that the JSON test passes, see:

http://logs.openstack.org/92/50892/10/check/check-tempest-devstack-vm-postgres-full/62894cb/console.html

or

http://logs.openstack.org/89/56889/1/check/check-tempest-devstack-vm-postgres-full/1602d9e/console.html

[David Kranz (david-kranz)]

This seems to affect json as well, but is flaky.