Nik Everett afbd7cbeb8 Rework the basic IT for GETing running tasks
This integ test relied on the false assumption that
`MockTaskManagerListener#onTaskUnregistered` was called *before* the
task was unregistered. It is in fact called after the task is unregistered.
This mistake led the test to *rarely* miss the task it was looking
for and fail.

Found by https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+5.x+multijob-unix-compatibility/os=ubuntu/4/consoleText
2016-09-13 11:59:50 -04:00
..
2016-08-30 13:31:24 -04:00