tmf: Switch views to the trace manager

tmf: Switch views to the trace manager

Remove getCurrentTime() and getCurrentRange() from ITmfTrace,
and transition its callers to the central trace manager.

Change-Id: Ib5138acb7cd252b40be07d0c0536bc73b60491bd
Signed-off-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Reviewed-on: https://git.eclipse.org/r/12354
Tested-by: Hudson CI
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
IP-Clean: Bernd Hufmann <bernd.hufmann@ericsson.com>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>