Fix for empty views that extend TmfView after restart (Bug 409345)

Fix for empty views that extend TmfView after restart (Bug 409345)

All views in Tmf/LTTng are affected by this problem:

- Add Handling of TmfTraceOpenedSignal in all relevant views
- The TmfUml2SDSyncLoader handles now the TmfTraceOpenedSignal
- TmfTrace is now registered as VIP listener for signals

Change-Id: Id0275bb44f72e4a05be8b91699958975c7b108f9
Signed-off-by: Bernd Hufmann <Bernd.Hufmann@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/13336
Tested-by: Hudson CI
Reviewed-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
IP-Clean: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Tested-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Reviewed-by: Patrick Tasse <patrick.tasse@gmail.com>
IP-Clean: Patrick Tasse <patrick.tasse@gmail.com>
Tested-by: Patrick Tasse <patrick.tasse@gmail.com>