Add special rsyslog filter for MSN2700 platform (sonic-net#16684)

- Why I did it
Mellanox MSN2700 platforms have a non-functional error log: "ERR pmon#sensord: Error getting sensor data: dps460/sonic-net#10: Can't read". This error is because of a firmware issue with some PSU, we are not able to upgrade the FW online. Since there is no functional impact, this error log can be ignored safely.

- How I did it
Add a new rsyslog rule to the rsyslog-container.conf.j2, if the docker name is pmon and the platform name matches, the new rule will be inserted into the docker rsyslogd.conf

- How to verify it
run regression on the MSN2700 platform to make the error log will not be printed to the syslog.

Signed-off-by: Kebo Liu <kebol@nvidia.com>

files/build_templates/docker_image_ctl.j2

@@ -47,10 +47,10 @@ function updateSyslogConf()
     {%- if docker_container_name == "database" %}
     python -c "import jinja2, os; paths=['/usr/share/sonic/templates']; loader = jinja2.FileSystemLoader(paths); env = jinja2.Environment(loader=loader, trim_blocks=True); template_file='/usr/share/sonic/templates/rsyslog-container.conf.j2'; template = env.get_template(os.path.basename(template_file)); data=template.render({\"target_ip\":\"$TARGET_IP\",\"container_name\":\"$CONTAINER_NAME\"}); print(data)" > $TMP_FILE
     {%- else %}
-    sonic-cfggen -d -t /usr/share/sonic/templates/rsyslog-container.conf.j2 -a "{\"target_ip\": \"$TARGET_IP\", \"container_name\": \"$CONTAINER_NAME\" }"  > $TMP_FILE
+    sonic-cfggen -d -t /usr/share/sonic/templates/rsyslog-container.conf.j2 -a "{\"target_ip\": \"$TARGET_IP\", \"container_name\": \"$CONTAINER_NAME\", \"platform\": \"$PLATFORM\" }"  > $TMP_FILE
     if [ $? -ne 0 ]; then
       echo "Error: Execute sonic-cfggen -d failed. Execute without '-d'."
-      sonic-cfggen -t /usr/share/sonic/templates/rsyslog-container.conf.j2 -a "{\"target_ip\": \"$TARGET_IP\", \"container_name\": \"$CONTAINER_NAME\" }"  > $TMP_FILE
+      sonic-cfggen -t /usr/share/sonic/templates/rsyslog-container.conf.j2 -a "{\"target_ip\": \"$TARGET_IP\", \"container_name\": \"$CONTAINER_NAME\", \"platform\": \"$PLATFORM\" }"  > $TMP_FILE
     fi
     {%- endif %}
     docker cp $TMP_FILE ${DOCKERNAME}:/etc/rsyslog.conf

files/image_config/rsyslog/rsyslog-container.conf.j2

@@ -52,7 +52,18 @@ $SystemLogRateLimitBurst 20000
 ###########################
 #### GLOBAL DIRECTIVES ####
 ###########################
+{% if container_name == 'pmon' %}
+{% if platform == 'x86_64-mlnx_msn2700-r0' or platform == 'x86_64-mlnx_msn2700a1-r0' %}
 
+# This rsyslog configuration is intended to resolve the following error message that only appears on the MSN2700 platform:
+# "ERR pmon#sensord: Error getting sensor data: dps460/#10: Can't read"
+# This error is because of firmware issue with some type of PSU, we are not able to upgrade the FW online.
+# Since there is no functional impact, this error log can be ignored safely.
+
+if $programname contains "sensord" and $msg contains "Error getting sensor data: dps460/#" then stop
+
+{% endif %}
+{% endif %}
 # Set remote syslog server
 template (name="ForwardFormatInContainer" type="string" string="<%PRI%>%TIMESTAMP:::date-rfc3339% %HOSTNAME% {{container_name}}#%syslogtag%%msg:::sp-if-no-1st-sp%%msg%")
 *.* action(type="omfwd" target="{{target_ip}}" port="514" protocol="udp" Template="ForwardFormatInContainer")