Changes

tmf: Add utility to detect directory traces from trace path

This utility checks whether the parent or grandparent path of given path
to a file is a valid directory trace. If it is a directory trace then
return the parent or grandparent path.

[Added] TmfTraceType.checkAndUpdateTracePath() to check directory traces

Signed-off-by: Bernd Hufmann <bernd.hufmann@ericsson.com>