Consul Agent received Caught second signal terminated. Exiting

#### Overview of the Issue
Consul agent is getting a Second sigterm signal.

I am running consul agent using consul docker image. Docker image is build using the consul image. When container is stopped graceful exit is happening but i can see in the logs that a second sigterm is received by the consul agent. Not sure from where it's coming.

From the docker i am executing a shell script start.sh which runs consul agent command in background. In consul agent configuration i have enabled
```
leave_on_terminate = true
skip_leave_on_interrupt = false
```
for the graceful shutdown.

Since the consul agent command is running as a child process the sigterm won't be forwarded to consul agent process, so I have trapped the sigterm in start.sh and forward it to consul process.
```
graceful_shutdown() {
echo "SIGTERM received"
trap '' SIGTERM SIGINT # clear the trap

consul_pid=$(ps -ef | grep "consul agent" | grep -v grep | awk '{print $1}')

kill -SIGTERM ${consul_pid} # Sends SIGTERM to child/sub processes
wait
echo DONE
}

trap graceful_shutdown SIGTERM SIGINT
```
I am assuming that consul process will get the SIGTERM and perform a graceful shutdown.. In the logs however its logging a second SIGTERM which i am not sure from where its coming.

```
{"@level":"info","@message":"Caught second signal, Exiting","@module":"agent","@timestamp":"2022-05-05T18:08:44.327411Z","signal":15}
```

Consul Version: 1.11.1
Host OS: MacOS
Docker version 20.10.10, build b485636

Anyone has seen this issue earlier?