[functional][u] increase journalctl output timestamp precision
|Category:||Enhancement to existing tests|
|Target version:||QA - future|
Currently, journal output is done using the default output format, which is using a 1s precision range.
I suggest to switch to "-o short-precise" which is using a microsecond precision (similar to the one used in "autoinst-log.txt" ).
I'd might be even better to switch to -o short-monotonic and use a similar format in autoinst-log.txt, to make logs not dependant on the exact date/time of the VM boot