Run docker containers with /tmp and /var/tmp mounted to tmpfs (#1313)

Author: pavel-shirshov

files/build_templates/docker_image_ctl.j2

@@ -63,6 +63,8 @@ start() {
 {%- if docker_container_name != "database" %}
         -v /usr/share/sonic/device/$PLATFORM/$HWSKU:/usr/share/sonic/hwsku:ro \
 {%- endif %}
+        --tmpfs /tmp \
+        --tmpfs /var/tmp \
         --name={{docker_container_name}} {{docker_image_name}}:latest
 
     postStartAction