Julian Oes 28f4dc10ae mavsdk_tests: make sure all log output is printed
This fixes the issue where the last lines of the log output was not
printed in case of error or on the verbose setting. This meant that
essentially the actual test error was not printed.

The fix involves two parts:
1. Firstly collect the output again even if a process has exited.
2. Collect all lines at once and not one line per iteration.
2020-04-03 11:45:35 +02:00
..
2019-10-14 10:53:13 -04:00