lttng: improve import from control view (bug 412337)

lttng: improve import from control view (bug 412337)

- Import dialog selects by default all traces
- Import dialog selects default project with name Remote. It will
be created if needed.
- For Kernel traces trace type "LTTng Kernel" will be set
- For UST trace trace type "Generic CTF Trace" will be set
- Trace name in project will be constructed with information about
session, kernel or ust, ust buffer type (UID or PID) etc by
concatenating the names of directories within a session.
- For network traces now the Batch Import Trace Wizard will be opened
instead of the legacy trace import wizard

Change-Id: Ife7c57868d2a4f2b5cbc6b1b6461a677b3998ea8
Signed-off-by: Bernd Hufmann <Bernd.Hufmann@ericsson.com>
Signed-off-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/15543
Tested-by: Hudson CI