tests: bt_diff_cli: compare expected `stderr` too
Useful to confirm that a trace is read without warnings but could also
be used to confirm that an expected warning is indeed present.
Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Change-Id: I0c48c68a0aac832729da2d9c5b849fb58ec578e4
Reviewed-on: https://review.lttng.org/c/babeltrace/+/1638
Tested-by: jenkins <jenkins@lttng.org>
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>
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