Add utility method to open a trace in the editor using SWTBot only

Add utility method to open a trace in the editor using SWTBot only

Change-Id: Ia98e7c029b46fdae4489e24ddfc0ee8c41963eb3
Signed-off-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/37715
Tested-by: Hudson CI
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Tested-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/37764
Reviewed-by: Hudson CI