Similarly to dnsmasq [0], other processes can receive SIGHUP. This is
allowed by rootwrap filters for all processes [1], and I found some
examples when running neutron-tempest-plugin tests checking
l3-agent.log files:
Running command (rootwrap daemon): ['radvd-kill', 'HUP', '712810'] execute_rootwrap_daemon /usr/lib/python3.6/site-packages/neutron/agent/linux/utils.py:103
Running command (rootwrap daemon): ['keepalived-kill', 'HUP', '402009'] execute_rootwrap_daemon /usr/lib/python3.6/site-packages/neutron/agent/linux/utils.py:103
To prevent additional similar issues, apply similar fix for these
sidecar containers too
Related-Bug: #1867192
[0] I1af2ecd9e3996de4f43224f66a8bdb81eab07022
[1] https://opendev.org/openstack/neutron/src/branch/master/etc/neutron/rootwrap.d
Change-Id: I31237d21527a2909a1669cb6c80cc0fa9be798a6