TMF: Do not send objects in TmfCoreTracer#traceComponent and #traceRequest

TMF: Do not send objects in TmfCoreTracer#traceComponent and #traceRequest

These tracing methods were sometimes called in constructors and called methods
from the object that it is not necessarily safe to use when the object is not
finished building. This patch fixes this.

Change-Id: I64acee3adb850b8e17f0be3c8a0bbe5d54e97bf8
Signed-off-by: Geneviève Bastien <gbastien+lttng@versatic.net>
Reviewed-on: https://git.eclipse.org/r/35902
Tested-by: Hudson CI
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>