[gnome-settings-daemon/benzea/tests-output-checker] XXX: Add pstree output

[Benjamin Berg <bberg src gnome org>]

commit 9c901ba976b0dcc4c16383461f50ef95f08de820
Author: Benjamin Berg <bberg redhat com>
Date:   Mon Feb 15 11:55:35 2021 +0100

    XXX: Add pstree output
    
    Seems like something is surviving the gnome-session process, maybe this
    shows us what is going on.

 plugins/power/test.py | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/plugins/power/test.py b/plugins/power/test.py
index dfa034a2..5c01489d 100755
--- a/plugins/power/test.py
+++ b/plugins/power/test.py
@@ -181,6 +181,7 @@ class PowerPluginBase(gsdtestcase.GSDTestCase):
         assert self.session
         self.session.terminate()
         self.session.wait()
+        subprocess.Popen(['pstree', '-la'])
         self.session_log.assert_closed()
 
     def check_logind_gnome_session(self):