tmf: Bug 494689: fix failing name conflict handling in trace import

tmf: Bug 494689: fix failing name conflict handling in trace import

This patch also adds test cases for RENAME_ALL and OVERWRITE_ALL in
the corresponding SWTBot test class.

It also fixes the test cases when overwriting existing resources
without confirmation.

Change-Id: I7b4a7779091d824502ea15a18573f162304d143b
Signed-off-by: Bernd Hufmann <Bernd.Hufmann@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/73759
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Tested-by: Jean-Christian Kouame <jean-christian.kouame@ericsson.com>
Reviewed-by: Hudson CI
Reviewed-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Tested-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>