Popen.terminate and Popen.kill in dockerblade don't behave as expected

[ChrisTimperley]

Popen.terminate and Popen.kill in dockerblade don't seem to be working. At least, the don't seem to be working the way the command line does.

I get the tracing:

2021-09-23 17:17:54.246 | INFO     | rosdiscover.cli:_periodic_observe:180 - Killing bash /tmp/tmp.RgfVxCnwQL.sh
2021-09-23 17:17:54.249 | INFO     | rosdiscover.cli:_periodic_observe:180 - Killing bash /tmp/tmp.PokDaCA8aV.sh
2021-09-23 17:17:54.267 | INFO     | rosdiscover.cli:_periodic_observe:180 - Killing bash /tmp/tmp.SEAp09MraL.sh

But when I open a shell, and do ps ux I see:

root      8821  0.0  0.0  20792  4180 pts/6    Ss+  17:15   0:00 bash /tmp/tmp.RgfVxCnwQL.sh
root     10056  0.0  0.0  20792  4152 pts/7    Ss+  17:16   0:00 bash /tmp/tmp.PokDaCA8aV.sh
root     10056  0.0  0.0  20792  4152 pts/7    Ss+  17:16   0:00 bash /tmp/tmp.PokDaCA8aV.sh

(As well as all the ros nodes). If from a terminal on the container I do kill 8821 etc, that stops the processes and the child processes.

Originally posted by @schmerl in #197 (comment)