headless-next: instead off 'killing' the stuck session, try to end

everything via loginctl
2 jobs for headless_hacks in 22 minutes and 39 seconds (queued for 23 seconds)
Status Job ID Name Coverage
  Python2 Nose
failed #6733724
python2

00:12:21

 
  Python3 Nose
passed #6733725
python3

00:10:17

 
Name Stage Failure
failed
python2 Python2 Nose There is an unknown failure, please try again

FAILED (errors=1, failures=2)
Redirecting to /bin/systemctl stop gdm.service
dogtail-run-headless-next: Using display manager: gdm
dogtail-run-headless-next: Using /usr/bin/gnome-shell to bind to the session
dogtail-run-headless-next: Started the script with PID 24426
dogtail-run-headless-next: The script has finnished with return code 1

ERROR: Build failed: Process exited with: 1. Reason was: ()