reboot machine in testflinger job and re-run DSS validations

contrib/checkbox-dss-validation/testflinger/job-def.yaml

@@ -59,3 +59,26 @@ test_data:
     ssh ubuntu@$DEVICE_IP '
       checkbox-dss.validate-with-gpu
     '
+
+    # Reboot the machine
+    ssh -t ubuntu@$DEVICE_IP '
+      SLEEP_SECS=15
+      >&2 echo "[INFO]: sleeping for ${SLEEP_SECS} seconds before rebooting."
+      sleep ${SLEEP_SECS}
+      >&2 echo "[INFO]: rebooting now.  Best of luck!"
+      sudo reboot
+    ' || >&2 echo "reboot started with exit code $?"
+
+    SLEEP_SECS=30
+    >&2 echo "[INFO]: sleeping for ${SLEEP_SECS} seconds for reboot to finish."
+    sleep ${SLEEP_SECS}
+    >&2 echo "[INFO]: attempting to reconnect."
+
+    # Re-test after reboot, attempting to connect max 30 times, waiting 10 sec each time
+    ssh -t ubuntu@$DEVICE_IP -o 'ConnectionAttempts 30' -o 'ConnectTimeout 10' '
+      SLEEP_SECS=60
+      >&2 echo "[INFO]: sleeping for ${SLEEP_SECS} seconds for things to settle down a bit."
+      sleep ${SLEEP_SECS}
+      sudo microk8s status --wait-ready
+      checkbox-dss.validate-with-gpu
+    '