[multiasic][database]database.sh failed to create the database for na…

…mespace (sonic-net#9502)

Why I did it
database.sh failed to create the database for namespace in multiasic platform.
The latest code Docker version 20.10.x, command "docker create" no longer takes optional "NET=" with empty value. Syntax error show with current docker create command in database.sh. Issue sonic-net#9503

How I did it
Modify the docker_image_ctl.j2 to set default network setting NET="bridge" instead of empty for namespace database.

files/build_templates/docker_image_ctl.j2

@@ -368,6 +368,7 @@ start() {
         fi
 
         {%- if docker_container_name == "database" %}
+        NET="bridge"
         DB_OPT=$DB_OPT" -v /var/run/redis$DEV:/var/run/redis:rw "
         {%- else %}
         NET="container:database$DEV"