tmf: Fix StandardImportGzipTraceTest failing when running from RunAllSWTBotTests

tmf: Fix StandardImportGzipTraceTest failing when running from RunAllSWTBotTests

StandardImportGzipTraceTest should delete its test project. Otherwise, other
tests using the same project name "Tracing" will fail to run. Also fix path
in TmfTestTrace for the test to work.

Change-Id: I908e9aaded2b47762ee07b36384257545d680300
Signed-off-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/51534
Reviewed-by: Hudson CI
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Tested-by: Matthew Khouzam <matthew.khouzam@ericsson.com>