Implement dispose of CTF traces

Implement dispose of CTF traces

Dispose method is implemented for CtfTmfTrace and its contained objects.
File streams are closed and references to MappedByteBuffer objects are
cleared. The trace manager is cleared when a trace is removed from the
iterator manager and the trace iterators are disposed.

Change-Id: I6a5f8cc73ef5157842c67bb5dd0e7a2cb38a23ff
Reviewed-on: https://git.eclipse.org/r/9338
Reviewed-by: Bernd Hufmann <bhufmann@gmail.com>
IP-Clean: Bernd Hufmann <bhufmann@gmail.com>
Tested-by: Bernd Hufmann <bhufmann@gmail.com>
Tested-by: Hudson CI
Reviewed-by: Patrick Tasse <patrick.tasse@gmail.com>