Initial work on returning floating license when using licensing server

dist/platforms/ubuntu/steps/return_license.sh

@@ -14,6 +14,20 @@ if [[ -n "$UNITY_SERIAL" ]]; then
     -logFile /dev/stdout \
     -quit \
     -returnlicense
+elif [[ -n "$UNITY_LICENSING_SERVER" ]]; then  #
+  #
+  # Return any floating license used.
+  #
+  echo "Returning floating licenses"
+  for file in ~/.config/unity3d/Unity/licenses/*.xml; do
+      echo "$file"
+      token=$(basename $file .xml)
+      /opt/unity/Editor/Data/Resources/Licensing/Client/Unity.Licensing.Client --return-floating $token
+      status=$?
+      echo "status $status"
+      echo "Returned $token"
+  done
+
 fi
 
 # Return to previous working directory