Poller stop sometimes let processes running

[mohierf]

Stopping Alignak do not always stop all running processes ...

$ service alignak stop
$ cat poller-poller_master.log
[2018-11-15 02:41:53] INFO: [poller-master.alignak.daemon] Daemon poller-master is living: loop #43201 ;)
[2018-11-15 03:37:08] INFO: [poller-master.alignak.daemon] received a signal: SIGTERM
[2018-11-15 03:37:08] INFO: [poller-master.alignak.daemon] request to stop the daemon
[2018-11-15 03:37:08] INFO: [poller-master.alignak.daemon] Someone asked us to stop now
[2018-11-15 03:37:08] INFO: [poller-master.alignak.daemon] stopped main loop: 1542253028.56
[2018-11-15 03:37:08] INFO: [poller-master.alignak.satellite] Exited from the main loop.
[2018-11-15 03:37:08] INFO: [poller-master.alignak.satellite] Stopping all workers (7)
[2018-11-15 03:37:08] INFO: [poller-master.alignak.satellite]  - stopping 'fork_7'
[2018-11-15 03:37:09] INFO: [poller-master.alignak.satellite] stopped
[2018-11-15 03:37:09] INFO: [poller-master.alignak.satellite]  - stopping 'fork_6'
[2018-11-15 03:37:10] INFO: [poller-master.alignak.satellite] stopped
[2018-11-15 03:37:10] INFO: [poller-master.alignak.satellite]  - stopping 'fork_5'
[2018-11-15 03:37:11] INFO: [poller-master.alignak.satellite] stopped
[2018-11-15 03:37:11] INFO: [poller-master.alignak.satellite]  - stopping 'fork_4'
[2018-11-15 03:37:12] INFO: [poller-master.alignak.satellite] stopped
[2018-11-15 03:37:12] INFO: [poller-master.alignak.satellite]  - stopping 'fork_3'
[2018-11-15 03:37:13] INFO: [poller-master.alignak.satellite] stopped
[2018-11-15 03:37:13] INFO: [poller-master.alignak.satellite]  - stopping 'fork_2'
[2018-11-15 03:37:14] INFO: [poller-master.alignak.satellite] stopped
[2018-11-15 03:37:14] INFO: [poller-master.alignak.satellite]  - stopping 'fork_1'
[2018-11-15 03:37:15] INFO: [poller-master.alignak.satellite] stopped
[2018-11-15 03:37:15] INFO: [poller-master.alignak.daemon] Stopping poller-master...
[2018-11-15 03:37:15] INFO: [poller-master.alignak.daemon] Shutting down synchronization manager...
[2018-11-15 03:37:15] INFO: [poller-master.alignak.daemon] Shutting down modules manager...
[2018-11-15 03:37:15] INFO: [poller-master.alignak.modulesmanager] Shutting down modules...
[2018-11-15 03:37:15] INFO: [poller-master.alignak.daemon] Shutting down HTTP daemon...
root@alignak_julien:~/mod-webui # ps -aux | grep alignak
alignak 88716  0.0  0.2 329084 105536  -  IJ   14:39    1:06.15 python2.7: alignak-poller-master worker fork_1 (python2.7)
alignak 88718  0.0  0.2 329096 105656  -  IJ   14:39    1:06.24 python2.7: alignak-poller-master worker fork_2 (python2.7)
alignak 88719  0.0  0.2 329108 105700  -  IJ   14:39    1:06.43 python2.7: alignak-poller-master worker fork_3 (python2.7)
alignak 88720  0.0  0.2 329120 105704  -  IJ   14:39    1:06.30 python2.7: alignak-poller-master worker fork_4 (python2.7)
alignak 88721  0.0  0.2 329132 105748  -  IJ   14:39    1:06.33 python2.7: alignak-poller-master worker fork_5 (python2.7)
alignak 88722  0.0  0.2 329144 105792  -  IJ   14:39    1:06.37 python2.7: alignak-poller-master worker fork_6 (python2.7)
alignak 88723  0.0  0.2 329156 105688  -  IJ   14:39    1:06.50 python2.7: alignak-poller-master worker fork_7 (python2.7)
root     2643  0.0  0.0   8328   1908  0  I+J  07:31    0:12.00 tail -f /var/log/alignak/alignak-events.log /var/log/alignak/arbiter-arbiter_master.log /var/log/a
root    95013  0.0  0.0  14828   2056  7  S+J  03:37    0:00.00 grep alignak

The poller worker processes are not stopped ...