is_warm_reboot_enabled() in xcvrd.py can not correctly detect warm reboot due to late start of pmon

[chiourung]

The delay of pmon is true, and pmon would start with a delay.
On a warm reboot, the value of WARM_RESTART_ENABLE_TABLE|system would be set to true, and after the WARMBOOT_FINALIZER it would be set to false.
But pmon will start after WARMBOOT_FINALIZER has finished, and is_warm_reboot_enabled() would return false.

[2024-08-07 14:33:34.623] admin@sonic:~$ redis-cli -n 6 hgetall "WARM_RESTART_ENABLE_TABLE|system"
[2024-08-07 14:33:36.695] 1) "enable"
[2024-08-07 14:33:36.695] 2) "true"
[2024-08-07 14:33:36.695] admin@sonic:~$ docker ps
[2024-08-07 14:33:38.784] CONTAINER ID   IMAGE                             COMMAND                  CREATED          STATUS         PORTS     NAMES
[2024-08-07 14:33:38.784] 42ba626dd413   docker-router-advertiser:latest   "/usr/bin/docker-ini…"   13 minutes ago   Up 2 minutes             radv
[2024-08-07 14:33:38.804] ff130d42c83e   docker-fpm-frr:latest             "/usr/bin/docker_ini…"   13 minutes ago   Up 2 minutes             bgp
[2024-08-07 14:33:38.804] 13bcfde779d8   docker-syncd-brcm:latest          "/usr/local/bin/supe…"   13 minutes ago   Up 2 minutes             syncd
[2024-08-07 14:33:38.842] c033a238d0ba   docker-teamd:latest               "/usr/local/bin/supe…"   13 minutes ago   Up 2 minutes             teamd
[2024-08-07 14:33:38.842] 52c8cfbcae85   docker-orchagent:latest           "/usr/bin/docker-ini…"   13 minutes ago   Up 2 minutes             swss
[2024-08-07 14:33:38.842] 0bf4250f1268   docker-eventd:latest              "/usr/local/bin/supe…"   13 minutes ago   Up 2 minutes             eventd
[2024-08-07 14:33:38.865] ab0e2e9b9120   docker-database:latest            "/usr/local/bin/dock…"   13 minutes ago   Up 2 minutes             database
[2024-08-07 14:33:38.865] admin@sonic:~$ redis-cli -n 6 hgetall "WARM_RESTART_ENABLE_TABLE|system"
[2024-08-07 14:33:41.034] 1) "enable"
[2024-08-07 14:33:41.034] 2) "false"
[2024-08-07 14:33:41.034] admin@sonic:~$ docker ps
[2024-08-07 14:33:43.004] CONTAINER ID   IMAGE                             COMMAND                  CREATED          STATUS         PORTS     NAMES
[2024-08-07 14:33:43.004] 5243a9eda309   docker-sonic-gnmi:latest          "/usr/local/bin/supe…"   11 minutes ago   Up 1 second              gnmi
[2024-08-07 14:33:43.025] 42ba626dd413   docker-router-advertiser:latest   "/usr/bin/docker-ini…"   13 minutes ago   Up 2 minutes             radv
[2024-08-07 14:33:43.025] ff130d42c83e   docker-fpm-frr:latest             "/usr/bin/docker_ini…"   13 minutes ago   Up 2 minutes             bgp
[2024-08-07 14:33:43.046] 13bcfde779d8   docker-syncd-brcm:latest          "/usr/local/bin/supe…"   13 minutes ago   Up 2 minutes             syncd
[2024-08-07 14:33:43.046] c033a238d0ba   docker-teamd:latest               "/usr/local/bin/supe…"   13 minutes ago   Up 2 minutes             teamd
[2024-08-07 14:33:43.046] 52c8cfbcae85   docker-orchagent:latest           "/usr/bin/docker-ini…"   13 minutes ago   Up 2 minutes             swss
[2024-08-07 14:33:43.088] 0bf4250f1268   docker-eventd:latest              "/usr/local/bin/supe…"   13 minutes ago   Up 2 minutes             eventd
[2024-08-07 14:33:43.088] ab0e2e9b9120   docker-database:latest            "/usr/local/bin/dock…"   13 minutes ago   Up 2 minutes             database
[2024-08-07 14:33:43.103] admin@sonic:~$ redis-cli -n 6 hgetall "WARM_RESTART_ENABLE_TABLE|system"docker ps
[2024-08-07 14:33:49.514] CONTAINER ID   IMAGE                                COMMAND                  CREATED          STATUS         PORTS     NAMES
[2024-08-07 14:33:49.514] c77c720ab127   docker-platform-monitor:latest       "/usr/bin/docker_ini…"   11 minutes ago   Up 2 seconds             pmon
[2024-08-07 14:33:49.537] 2965e04beadd   docker-sonic-mgmt-framework:latest   "/usr/local/bin/supe…"   11 minutes ago   Up 4 seconds             mgmt-framework
[2024-08-07 14:33:49.537] 4d653ad6155f   docker-lldp:latest                   "/usr/bin/docker-lld…"   11 minutes ago   Up 6 seconds             lldp
[2024-08-07 14:33:49.563] 5243a9eda309   docker-sonic-gnmi:latest             "/usr/local/bin/supe…"   11 minutes ago   Up 8 seconds             gnmi
[2024-08-07 14:33:49.563] 42ba626dd413   docker-router-advertiser:latest      "/usr/bin/docker-ini…"   13 minutes ago   Up 2 minutes             radv
[2024-08-07 14:33:49.604] ff130d42c83e   docker-fpm-frr:latest                "/usr/bin/docker_ini…"   13 minutes ago   Up 2 minutes             bgp
[2024-08-07 14:33:49.604] 13bcfde779d8   docker-syncd-brcm:latest             "/usr/local/bin/supe…"   13 minutes ago   Up 2 minutes             syncd
[2024-08-07 14:33:49.604] c033a238d0ba   docker-teamd:latest                  "/usr/local/bin/supe…"   13 minutes ago   Up 2 minutes             teamd
[2024-08-07 14:33:49.623] 52c8cfbcae85   docker-orchagent:latest              "/usr/bin/docker-ini…"   13 minutes ago   Up 2 minutes             swss
[2024-08-07 14:33:49.623] 0bf4250f1268   docker-eventd:latest                 "/usr/local/bin/supe…"   13 minutes ago   Up 2 minutes             eventd
[2024-08-07 14:33:49.655] ab0e2e9b9120   docker-database:latest               "/usr/local/bin/dock…"   13 minutes ago   Up 2 minutes             database