Fix bug: if all containers killed, service stop will throw exception …

…because no redis (#2139)

Signed-off-by: Qi Luo <qiluo-msft@users.noreply.github.com>

files/build_templates/docker_image_ctl.j2

@@ -39,18 +39,18 @@ function postStartAction()
 {%- endif %}
 }
 
-# Obtain our platform as we will mount directories with these names in each docker
-PLATFORM=`sonic-cfggen -H -v DEVICE_METADATA.localhost.platform`
+start() {
+    # Obtain our platform as we will mount directories with these names in each docker
+    PLATFORM=`sonic-cfggen -H -v DEVICE_METADATA.localhost.platform`
 
-{%- if docker_container_name == "database" %}
-# Don't mount HWSKU in {{docker_container_name}} container.
-HWSKU=""
-{%- else %}
-# Obtain our HWSKU as we will mount directories with these names in each docker
-HWSKU=`sonic-cfggen -d -v 'DEVICE_METADATA["localhost"]["hwsku"]'`
-{%- endif %}
+    {%- if docker_container_name == "database" %}
+    # Don't mount HWSKU in {{docker_container_name}} container.
+    HWSKU=""
+    {%- else %}
+    # Obtain our HWSKU as we will mount directories with these names in each docker
+    HWSKU=`sonic-cfggen -d -v 'DEVICE_METADATA["localhost"]["hwsku"]'`
+    {%- endif %}
 
-start() {
     DOCKERCHECK=`docker inspect --type container {{docker_container_name}} 2>/dev/null`
     if [ "$?" -eq "0" ]; then
         DOCKERMOUNT=`getMountPoint "$DOCKERCHECK"`