switch to use host syslog to for openbmp logging (sonic-net#22817)

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#### Why I did it
openbmp is using dedicated logging now, which has potential log spawn issue

##### Work item tracking
- Microsoft ADO **(number only)**: 27588893

#### How I did it
switch to use syslog and rotate will be done together with syslog.

#### How to verify it
verified on device which works fine

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Author: mssonicbld

dockers/docker-sonic-bmp/Dockerfile.j2

@@ -40,11 +40,10 @@ COPY ["files/supervisor-proc-exit-listener", "/usr/bin"]
 COPY ["critical_processes", "/etc/supervisor/"]
 
 RUN chmod +x /usr/bin/bmp.sh
-RUN touch /var/log/openbmpd.log
 
 RUN apt-get clean -y      && \
     apt-get autoclean -y  && \
     apt-get autoremove -y && \
     rm -rf /debs
 
-ENTRYPOINT ["/usr/local/bin/supervisord"]
+ENTRYPOINT ["/usr/local/bin/supervisord"]

dockers/docker-sonic-bmp/supervisord.conf

@@ -49,7 +49,7 @@ stderr_logfile=syslog
 dependent_startup=true
 
 [program:openbmpd]
-command=/usr/bin/openbmpd -f -l /var/log/openbmpd.log -c /etc/bmp/openbmpd.conf
+command=/usr/bin/openbmpd -f -c /etc/bmp/openbmpd.conf
 priority=3
 autostart=false
 autorestart=false