Reorder operations in _endlog so failure messages get
printed prior to performing callbacks and cleanup. This
helps clarify why a test failed and places the message
closer to the point of incident in the resulting logs.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Closes#6281