Bug 2189208

Description of problem:
An OSP17.1 environment is deployed using the following configuration in a THT file:
FrrOvnBgpAgentReconcileInterval: 999999

The configuration is successfully applied to both controller and computes:
[root@cmp-3-1 ~]# crudini --get /var/lib/config-data/ansible-generated/ovn-bgp-agent/etc/ovn-bgp-agent/bgp-agent.conf DEFAULT reconcile_interval
999999
[root@cmp-3-1 ~]# podman exec -ituroot ovn_bgp_agent crudini --get /etc/ovn-bgp-agent/bgp-agent.conf DEFAULT reconcile_interval
999999

However, the logs show that the sync process is executed every two minutes:
[root@cmp-3-1 ~]# tail -f /var/log/containers/stdouts/ovn_bgp_agent.log | grep "Running reconciliation loop to ensure routes"                                                                                                                                                                                                                                       
2023-04-24T10:16:21.354719383+00:00 stdout F 2023-04-24 10:16:21.354 31494 INFO ovn_bgp_agent.agent [-] Running reconciliation loop to ensure routes/rules are in place.                                                                      
2023-04-24T10:18:26.488304881+00:00 stdout F 2023-04-24 10:18:26.487 31494 INFO ovn_bgp_agent.agent [-] Running reconciliation loop to ensure routes/rules are in place.                                                                      ^C                                                                                                                                                                                                     


The default reconcile_interval value is 120 seconds, so it seems the configured value was ignored and the default value was used instead.


I added some logs to both ovn_bgp_agent.agent and oslo_service.periodic_task and it seems the configured value is correctly obtained by the agent, but not by the periodic_task module:
2023-04-24T12:15:03.248789871+00:00 stdout F 2023-04-24 12:15:03.244 451141 DEBUG oslo_service.periodic_task [-] Running periodic task BGPAgent.sync - spacing = 120 run_periodic_tasks /usr/lib/python3.9/site-packages/oslo_service/periodic_task.py:210
2023-04-24T12:15:03.248789871+00:00 stdout F 2023-04-24 12:15:03.246 451141 INFO ovn_bgp_agent.agent [-] Running reconciliation loop to ensure routes/rules are in place. - reconcile_interval = 999999


Version-Release number of selected component (if applicable):
RHOS-17.1-RHEL-9-20230419.n.1

How reproducible:
100%

Steps to Reproduce:
1. configure reconcile_interval with a value different from 120, either using tripleo (and deploying the overcloud after that) or directly on the .conf file (and restarting the ovn_bgp_agent service after that)
2. check how often the sync process is executed (use the grep command shown above)

Actual results:
sync is always executed every 120 seconds, ignoring the configured value

Expected results:
the configured value should not be ignored