Fix docker auto restart issue (#21377)

Why I did it
if critical process crashes or killed, bmp docker container will not be auto-restarted.

How I did it
/usr/bin/supervisor-proc-exit-listener takes in charge of critical process monitor and event publish, thus it should be autorestar-ted in any case, otherwise there might be issue if supervisor-proc-exit-listener crashes, or in some test cases like
"docker exec bmp kill -SIGKILL -1" critical processes may not work correctly in some race condition (depends on whether supervisor-proc-exit-listener is the last one to be killed)

When a container receives the SIGKILL signal to terminate its processes, the order in which the processes are actually terminated can depend on the scheduling and resource availability within the container.

If supervisor-proc-exit-listener is killed first before critical process, container auto restart will not be launched as expected.

dockers/docker-sonic-bmp/supervisord.conf

@@ -16,7 +16,7 @@ buffer_size=1024
 command=/usr/bin/supervisor-proc-exit-listener --container-name bmp
 events=PROCESS_STATE_EXITED,PROCESS_STATE_RUNNING
 autostart=true
-autorestart=false
+autorestart=unexpected
 buffer_size=1024
 
 [program:rsyslogd]

dockers/docker-sonic-gnmi/supervisord.conf

@@ -16,7 +16,7 @@ buffer_size=1024
 command=/usr/bin/supervisor-proc-exit-listener --container-name gnmi
 events=PROCESS_STATE_EXITED,PROCESS_STATE_RUNNING
 autostart=true
-autorestart=false
+autorestart=unexpected
 buffer_size=1024
 
 [program:rsyslogd]

dockers/docker-sonic-restapi/supervisord.conf

@@ -16,7 +16,7 @@ buffer_size=1024
 command=/usr/bin/supervisor-proc-exit-listener --container-name restapi
 events=PROCESS_STATE_EXITED,PROCESS_STATE_RUNNING
 autostart=true
-autorestart=false
+autorestart=unexpected
 buffer_size=1024
 
 [program:rsyslogd]

dockers/docker-sonic-telemetry/supervisord.conf

@@ -16,7 +16,7 @@ buffer_size=1024
 command=/usr/bin/supervisor-proc-exit-listener --container-name telemetry
 events=PROCESS_STATE_EXITED,PROCESS_STATE_RUNNING
 autostart=true
-autorestart=false
+autorestart=unexpected
 buffer_size=1024
 
 [program:rsyslogd]