This test was failing intermittently due to an incorrect
way of waiting for a job execution to finish, which is:
```
while(jobExecution.isRunning()) {
// wait for async launched job to complete execution
}
```
`JobExecution#isRunning()` is based on the status
of the job execution in memory which might not be
persisted yet. Here is an excerpt from the Javadoc:
```
Test if this JobExecution indicates that it is
running. It should be noted that this does not
necessarily mean that it has been persisted as
such yet.
```
That's why in the case where `isRunning` returns
false and the JobExecution is not persisted yet
(which is still in a running status in db),
the second attempt of re-running the job fails
with a `JobExecutionAlreadyRunningException`.
This commit fixes the loop by continuously
checking the status of the Job execution
in the job repository until it reaches one
of the end statuses.
Issue #1121
cf2642223d