[docker script] skip docker mount point checking for database contain…

…er (sonic-net#2683)

database container doesn't mount hwsku folder.

Signed-off-by: Ying Xie <ying.xie@microsoft.com>

files/build_templates/docker_image_ctl.j2

@@ -103,9 +103,17 @@ start() {
 
     DOCKERCHECK=`docker inspect --type container {{docker_container_name}} 2>/dev/null`
     if [ "$?" -eq "0" ]; then
+        {%- if docker_container_name == "database" %}
+        DOCKERMOUNT=""
+        {%- else %}
         DOCKERMOUNT=`getMountPoint "$DOCKERCHECK"`
-        if [ "$DOCKERMOUNT" == "$HWSKU" ]; then
+        {%- endif %}
+        if [ x"$DOCKERMOUNT" == x"$HWSKU" ]; then
+            {%- if docker_container_name == "database" %}
+            echo "Starting existing {{docker_container_name}} container"
+            {%- else %}
             echo "Starting existing {{docker_container_name}} container with HWSKU $HWSKU"
+            {%- endif %}
             preStartAction
             docker start {{docker_container_name}}
             postStartAction