tmf: Support open trace to selected trace folder

tmf: Support open trace to selected trace folder

Make the Open Trace File and Open Trace Directory commands import the
trace to the selected folder instead of the project's "Traces" folder.

Also fixed link validation to accept INFO and WARNING return status.

Change-Id: I870431335d40df43a180ec6400aaddc24d2d0117
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Signed-off-by: Bernd Hufmann <Bernd.Hufmann@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/25440
Tested-by: Hudson CI
Reviewed-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Tested-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>