Merge branch 'L2SS-989-faster-ds-teardown' into 'master'

Resolve L2SS-989 "Faster ds teardown"

Closes L2SS-989

See merge request !436

docker-compose/device-xst.yml

@@ -52,3 +52,5 @@ services:
       # can't know about our Docker port forwarding
       - l2ss-xst XST STAT -v -ORBendPoint giop:tcp:0:5706 -ORBendPointPublish giop:tcp:${HOSTNAME}:5706
     restart: unless-stopped
+    stop_signal: SIGINT # request a graceful shutdown of Tango
+    stop_grace_period: 2s