Wait until the bag recorder saved the bag file

Recently many bag files ware corruped. One possible cause is that rospy
is shutting down while the bagrecorder is still saving. So we introduce
a new /logger/shutdown service which is advertised after the recorder
finished. The navigation test subsequently waits for that service and
calls it.
Sanitze the '/' char in paths
Use only the actual navigation name as navigation argument

In the main navigation.test file it's already done like this, but now
amend the debugging file solo.launch as well
Set the default value for deleteOnError to ask