Comment 1 for bug 1511311

I can't reproduce this bug by rm .pid file and keep .pid-vrrp file. When I restart neutron-l3-agent, I can have keepalived process re-spawned.
Bug look into the keepalived code[1-3], it may be because the vrrp process is alive, while keepalived process is dead. So, neutron code can't detect the keepalived process, meanwhile, neutron can't re-spawn the keepalived process too.
[1]
https://github.com/acassen/keepalived/blob/03da0d2d0393808bbb2feac7abc07aaf8d647855/keepalived/core/main.c#L236
[2]
https://github.com/acassen/keepalived/blob/03da0d2d0393808bbb2feac7abc07aaf8d647855/keepalived/core/main.c#L291
[3] https://github.com/acassen/keepalived/blob/03da0d2d0393808bbb2feac7abc07aaf8d647855/keepalived/core/pidfile.c#L92